A little knowledge. A fresh perspective.

Good questions.
Clear answers.

Start with signatures and editions, or dig into printmaking, attribution, and conservation. There’s something here for your first piece and your next discovery.

Gallery illustration with a charcoal question-mark sculpture, a painting of The Thinker, and framed conversation bubbles

61 questions. No art degree required.

Artwork & print types

What it is, and how it was made.

What is the difference between an original artwork, an original print, and a reproduction?

A painting or drawing may be a single, unique work. An original print is an artwork created specifically through printmaking; several impressions can each be originals. A reproduction copies an existing artwork, such as a painting photographed and printed on paper. Ask how the image was created and what role the artist had. The word ‘print’ alone does not tell you which you are buying.

What is a serigraph? Is it the same as a screenprint?

A serigraph is a screenprint. Ink is pushed through open areas of a fine mesh screen while a stencil blocks the rest. Different colors are often printed in separate layers. ‘Silkscreen’ is another name for the process. The term describes how the work was made; ask separately whether a particular piece is an original artist-created print or a reproduction of another artwork.

What is a lithograph?

Lithography is a printing process based on the fact that oil and water repel each other. An image is prepared on a flat stone or metal plate, ink adheres to the image areas, and a press transfers it to paper. Artists can create original lithographs. Commercial reproductions also use related processes, so the label alone does not establish an artwork’s originality.

What is a giclée print?

Giclée is a term used for fine art inkjet printing. A printer deposits tiny droplets of ink onto paper or another suitable surface. It often reproduces an existing painting, although artists can also create digital works specifically to be printed. Ask about the inks, surface, edition, and whether the image is an original digital work or a reproduction. The name alone is not a complete quality specification.

What is the difference between an etching and an engraving?

Both print from lines recessed into a plate. In etching, a chemical solution bites the exposed lines into metal. In engraving, the artist cuts the lines directly with a tool. Ink stays in the recesses, and pressure transfers it to paper. These are printmaking methods, so an etching or engraving can be an original print rather than a copy of a painting.

What is the difference between an oil painting and an acrylic painting?

Oil paint suspends pigment in a drying oil and usually dries slowly, giving artists time to blend and revise. Acrylic uses a synthetic resin binder and commonly dries much faster. Either can be applied thinly or built into texture. Both are established artist materials. The medium tells you about the artist’s materials and working process; it does not, by itself, rank the artwork’s quality.

What does ‘work on paper’ mean? Is it always a print?

‘Work on paper’ names the surface, not the technique. It can be a unique drawing, watercolor, or painting, as well as a print. For example, watercolor is usually painted on paper, while an etching is printed onto it. Look for the full medium description, such as ‘watercolor on paper’ or ‘lithograph on paper,’ to understand what the artist actually made.

If an artwork is on canvas, does that mean it is an original painting?

Canvas is a woven fabric used as an artwork’s support. It tells you what the image sits on, not how it was made. Paintings can be created on canvas, and images can also be printed onto fabric. Read the complete description and ask whether the piece was painted by hand, printed, or printed and then worked on by hand.

What does ‘mixed media’ mean?

Mixed media means an artist combined different materials or techniques in one artwork, such as paint, ink, and collage. It is a broad description, so ask which materials are present and how the work was made. That detail helps you understand its appearance and discuss appropriate framing and care. The label by itself does not say whether a piece is unique or editioned.

What is a monotype or monoprint?

These terms describe prints with a unique result. A monotype is commonly made by painting or drawing ink onto a smooth surface and transferring it to paper. A monoprint may use a repeatable plate or block, with unique inking, coloring, or collage making that impression different. Usage varies, so ask what makes the particular work unique and which parts of its image can be repeated.

Signatures & editions

Make sense of the marks in the margin.

What is the difference between a limited edition and an open edition?

A limited edition has a fixed maximum number of examples within that edition. An open edition has no predetermined quantity limit. Neither term alone tells you the printing method or quality. An unnumbered print is not automatically an open edition: it could, for example, carry a proof designation instead. Ask for the publisher’s edition details.

What is the difference between signed and unsigned art?

A signed work carries an artist’s signature; an unsigned work does not. For prints, the expected signature depends on the particular edition. Some were issued unsigned, some were initialed, and others carry a stamped signature or a signature on a portfolio title page. An unsigned work is not automatically a reproduction or a fake.

Is a printed signature the same as a hand signature?

No. A hand signature is physically added to that individual artwork, often in pencil on a print. A plate signature is part of the printing surface, so it prints along with the image. A reproduced signature is also not a hand signature. Ask which kind is present and how it matches the documented edition.

What do numbers such as 25/100 mean on a print?

The first number identifies the individual impression; the second gives the size of the numbered edition. So 25/100 identifies impression 25 in a numbered edition of 100. There may also be artist’s proofs or other authorized proofs recorded separately. Ask about the complete edition information, rather than assuming the denominator counts every example made.

Can a print be signed but not numbered?

Yes. A print can be signed but unnumbered, or numbered but unsigned. A signature and an edition number tell you different things. A signature alone does not establish a limited edition; some open editions are signed, while proofs may carry letters instead of numbers. Ask how the work was published and what records explain its markings.

Is a lower edition number better than a higher one?

Not automatically. Within the same edition, a lower number is generally not more valuable simply because it is lower. Compare the actual impression’s condition, documentation, and quality. The edition’s overall size and the significance of the work usually tell you more than whether the fraction begins with 5 or 95.

What do AP and EA mean?

AP means artist’s proof. EA comes from the French épreuve d’artiste and refers to the same category. These impressions are set aside outside the standard numbered edition, traditionally for the artist, and may have their own numbering. They are not automatically better-quality prints. Ask how many proofs were authorized in addition to the main edition.

What do PP, HC, and BAT mean?

PP means printer’s proof, traditionally reserved for the printer or publisher. HC means hors commerce, originally indicating an impression outside normal commercial distribution, although these proofs can appear for sale. BAT means bon à tirer: the approved reference impression used to guide printing. These labels describe an impression’s role, so ask for the edition records behind the abbreviation.

What is provenance, and why should I ask about it?

Provenance is an artwork’s history, including where it originated, who owned it, and how it moved between owners or locations. It helps put the work in context and can support research into authenticity. Ask what history is documented and keep those records with the artwork, while distinguishing documented facts from gaps or uncertain information.

Does a signature or certificate guarantee that an artwork is authentic?

Treat a signature or certificate as part of the evidence, rather than the whole answer. Ask who issued the documentation and how it identifies this particular work. Specialists may compare the medium, dimensions, paper, edition details, and inscriptions with reliable reference records. A photograph alone may not be enough; some questions need an expert’s firsthand examination.

Framing & care

Help the art you love feel at home.

What makes a frame good quality?

A beautiful frame should protect the artwork as well as complement it. Ask what sits behind the art, how it is attached, and whether the glass or acrylic is appropriate for the medium. Conservation framing considers the whole package: suitable mats and backing, careful mounting, and protection from the environment. An ornate or expensive frame alone does not tell you how well the artwork is protected.

Why do acid-free mats and backing matter?

Materials touching or sitting behind paper artwork can affect it over time. Poor-quality cardboard and wood-based backing can introduce acids and contribute to discoloration. Preservation-quality mats and backing help reduce that risk. Ask about the actual materials throughout the frame, including lignin content and mounting methods, rather than relying only on an 'archival' label. Photographs can require materials tested specifically for photographic use.

Should I choose glass or acrylic for my frame?

The right choice depends on the work, its size, and how it will be displayed or moved. Acrylic is less prone to breaking, which can be useful during transport. Ordinary acrylic can build up static, however, making it a concern for powdery media such as pastel or charcoal. Ask a knowledgeable framer about a suitable glazing product for the particular artwork, including any anti-static requirements.

Does UV-protective glass prevent all fading?

No. UV-filtering glazing can reduce one important source of damage, but visible light also affects sensitive materials, and exposure adds up over time. Anti-reflective glazing and UV protection describe different features, so ask what a product actually does. Keep light-sensitive works, especially works on paper, out of direct sun and discuss appropriate display conditions with the dealer or a conservation professional.

Can the artwork touch the glass?

For works on paper, the artwork should generally be separated from the glass or acrylic by an appropriate window mat or spacer. Contact can lead to pigment transfer or sticking, especially with unstable surfaces. The gap and mounting method need to suit the work, so simply pressing it between glass and a backing board is not a sound preservation approach. Ask the framer how that separation will be maintained.

Where is the safest place to hang art at home?

Choose a secure location away from direct sunlight, radiators, heating vents, and fireplaces. Aim for fairly stable indoor conditions rather than places with frequent heat or moisture changes. Use hanging hardware and wall fixings suited to the weight of the complete framed work. If the spot is particularly sunny, damp, or close to a heat source, discuss another location before installing the artwork.

Does a painting on canvas need a frame or glass?

There is no single answer for every canvas. A frame can help protect the edges and support safer handling, while glazing can provide additional protection in appropriate circumstances. The painting's medium, surface, condition, and intended display all matter. Ask whether the work is ready to hang and what protection is recommended for that specific piece, rather than assuming that every canvas should be framed in the same way.

Can I clean an artwork myself?

Care depends on the material and condition, so ask for guidance before touching the surface. Avoid household cleaners, water, and rubbing the image. Even dusting can damage loose paint or change a delicate matte finish. If you notice flaking, stains, mold, or other damage, consult a qualified conservator. Follow the glazing manufacturer's instructions when cleaning the outside of a frame, and keep liquids away from the art.

What should I ask about an artwork's condition?

Ask about fading, staining, tears, paint loss, repairs, and previous conservation treatment, as well as the frame's condition. A condition report records what was observed at a particular time, ideally supported by clear photographs. It helps you understand what you are buying and gives you a reference for future changes. Older art can show signs of age; the useful question is what those signs mean for this particular work.

What should I ask before an artwork is shipped?

Ask who will pack the work, how the packing will suit its size and fragility, and who will handle transport. Discuss protection from impact and changes in temperature or humidity, and request photographs documenting its condition before travel. Agree on the delivery arrangements and any coverage or claims process in advance. A shipping label alone does not tell you whether an artwork has been prepared safely for the journey.

Advanced art FAQs

What can a watermark tell you? How does an attribution hold up? These questions look more closely at how art is made, researched, and preserved.

Advanced printmaking

The processes, papers, and workshop marks behind a print.

What is aquatint, and why can it resemble a watercolor wash?

Aquatint is an intaglio process that creates areas of tone rather than only lines. A granular resist allows acid to bite many tiny ink-holding recesses into a metal plate. Different depths and repeated stages produce lighter and darker areas. Its soft washes can resemble watercolor, although the image is printed from an inked plate.

Why do drypoint lines look soft or velvety?

A drypoint needle scratches directly into a plate and pushes up a ridge of metal called a burr. That ridge catches extra ink, giving the printed line its soft edge. The burr wears under printing pressure, so impressions can differ. Compare the actual lines and condition rather than assuming an edition number tells you when a sheet was printed.

How does a mezzotint create such deep blacks?

The printmaker first roughens a metal plate so it can hold a dense layer of ink. Smoothing selected areas then creates lighter tones; the smoothest areas print lightest. This process works from dark toward light and can produce gradual transitions. Look for the relationship between dark passages and highlights when examining an impression.

What is chine collé, and why are there two papers?

Chine collé combines a thin paper carrying the printed image with a heavier supporting sheet. They are bonded during printing, sometimes with added adhesive. The thin paper may provide a different color or surface for the image. Two visible paper layers can therefore be intentional, rather than evidence of a repair or later mounting.

How is a wood engraving different from a woodcut?

Both are relief processes: ink prints from the areas left raised. A wood engraving is typically cut with engraving tools into the end grain of a wood block, allowing very fine marks. A woodcut is usually carved along the grain. The distinction describes the working surface and tools; it does not establish which print is better.

Is a photogravure a photograph or a print?

Photogravure uses a photographic image to prepare an etched printing plate, which is then inked and printed as an intaglio print. It is different from a conventional photographic print on light-sensitive paper. The term describes a process, so ask who created the image, who printed the sheet, and how that particular edition was produced.

What does a printer’s blindstamp or chop tell me?

A chop identifies a printer or workshop through a stamped or embossed mark, often in the margin. A blindstamp is impressed without ink. It can help connect a sheet to its production history, but it is different from the artist’s handwritten signature. Compare the mark with documented workshop examples and the other records for the print.

What is pochoir, and why does hand-applied color matter?

Pochoir is color applied by hand through stencils. It may create an entire image or add color to an already printed design. Small differences between sheets can reflect the hand-coloring process. Ask whether the color belongs to the work’s original production or was added later; “hand-colored” alone does not answer that question.

What is a collagraph?

A collagraph starts with a printing surface built from attached materials and textures, rather than only cut or etched marks. Depending on how it is inked, the artist can print from raised surfaces, recessed areas, or both. The resulting texture is part of the process. Ask about the materials and printing method when a listing simply says “mixed-media print.”

Attribution & provenance

How records, expert opinions, and examination fit together.

What is a catalogue raisonné, and how do I use an entry?

A catalogue raisonné is a scholarly record of an artist’s work, sometimes limited to a medium or period. Entries may record dimensions, images, ownership, exhibitions, and publications. Compare those details with the actual object, not just its title. Note the catalogue’s author, date, and scope; a matching title alone does not establish that a work is the listed object.

How does “attributed to” differ from “by” an artist?

“By” generally states the seller’s opinion that the named artist made the work. “Attributed to” expresses a qualified opinion, with some uncertainty. These are meaningful distinctions, not interchangeable wording. Read that seller’s attribution glossary and terms, and ask which evidence supports the description. Different sellers may define their terminology differently.

What do “studio of,” “circle of,” “follower of,” and “after” mean?

These descriptions usually indicate different relationships to an artist. “Studio of” points to the workshop; “circle of” to an associated artist or contemporary; “follower of” to someone working in the artist’s style, often later. “After” generally identifies a copy of a known work. None automatically means the named artist painted it. Check the seller’s definitions.

How does exhibition history differ from ownership history?

Exhibition history records where a work was shown; provenance tracks who owned it and how it changed hands. A museum exhibition may have included a loan from a private collector, so being exhibited there does not establish museum ownership. Ask for the exhibition catalogue, dates, lender information, and a matching entry when an exhibition is cited.

Why should I look at the back of an artwork and its labels?

Labels, stamps, inscriptions, and inventory numbers can provide leads to dealers, exhibitions, collectors, or earlier locations. Getty’s provenance researchers use physical evidence alongside archives and published records. Ask for clear photographs and compare the details with those records. A label is evidence to investigate; its presence alone does not settle authorship or ownership history.

How should I approach a gap in provenance, especially from 1933 to 1945?

Missing records can have ordinary explanations, including lost archives and private transactions. They still deserve investigation, particularly for works that may have changed hands in Europe during Nazi persecution and wartime looting. Ask what is known, what remains unverified, and which records were checked. A gap alone establishes neither wrongdoing nor a complete, cleared ownership history.

Can a laboratory test prove who painted a picture?

Material tests can show whether pigments, supports, or other components fit a proposed date and working practice. They can also reveal inconsistencies. That is different from identifying the hand that painted a work: compatible materials may have been used by many artists. Authentication usually combines technical findings with visual expertise and documentary research.

What can infrared examination reveal beneath a painting?

Infrared examination can make some underdrawing and changes beneath the paint visible. Results depend on the pigments, drawing materials, and equipment; carbon-based drawing over a pale ground can be especially revealing. A blank-looking infrared image does not prove that no underdrawing exists. The findings need interpretation alongside the painting’s materials and other evidence.

What is a pentimento, and does it prove authenticity?

A pentimento is an earlier element that the artist changed while developing a painting. It may become visible as paint grows more transparent, or through technical examination. Such changes can help explain how a composition developed and may contribute to attribution. They are one piece of evidence, rather than a certificate that a named artist painted the work.

What can a paper watermark tell me?

A traditional watermark is a thinner area formed by a design in the papermaking mould, often visible with transmitted light. Its design, together with other paper features, can help researchers investigate the sheet’s origin and approximate age. It identifies evidence about the paper, rather than proving who drew or printed on it. Compare it with documented examples.

Materials & conservation

Reading condition reports and understanding changes over time.

Is craquelure the same as flaking paint?

Craquelure means a network of cracks in a painting’s layers. Flaking means paint or ground is partly or completely detaching. Some cracking can remain stable, while lifting flakes may lead to loss. Ask whether the paint is secure and whether a conservator has examined it; a photograph of cracks alone cannot establish the painting’s stability.

What does it mean if a canvas painting has been lined?

Lining adds a second fabric support behind the original canvas, often as part of an earlier conservation treatment. It describes treatment history, rather than automatically making a painting unacceptable. Ask when and why it was done, what method was used, and how the painting is behaving now. A condition report should assess the result, not merely list “lined.”

What is the difference between inpainting and overpainting?

Inpainting fills areas where original paint is missing or abraded. Overpainting covers surviving original paint with later, non-original paint and can extend beyond the damaged area. The location and extent matter when assessing condition. Ask for a report that distinguishes the two and explains what examination supports the finding, rather than relying on a vague reference to restoration.

Why can an old painting look yellow even when its paint has not changed?

An aging varnish can discolor and alter how the paint beneath it appears. Some natural resin varnishes become yellow and less transparent over time. That does not mean every yellow passage is varnish or that removal is appropriate. A conservator needs to distinguish the coating from the paint and assess treatment risks; household cleaning products are unsuitable.

What is the difference between a stretcher and a strainer?

Both support a stretched canvas. A strainer has fixed corners; a stretcher has joints designed to allow adjustment, often with small wooden keys. The distinction can matter in a condition report because movement and tension affect the painting’s layers. Do not tap the keys simply to remove slack: excessive expansion can crack paint.

How do ground, pigment, and binder affect a painting’s condition?

A ground prepares the support and provides a surface for painting. Pigment supplies color, while the binder holds the paint together. Those materials and their interaction affect adhesion, flexibility, and aging. Two paintings in the same medium can therefore develop different problems. A useful condition report identifies which layer is affected, rather than saying only that the surface is damaged.

Is foxing the same as active mold?

Foxing describes scattered brown spots on paper; it does not identify one single cause. Fungal activity, metal particles, and other reactions can produce similar-looking marks. The spots alone do not establish that mold is currently active. Ask a paper conservator to assess the cause and condition, and avoid home bleaching or sunlight treatments that can damage the sheet.

Why is a work on paper wavy or cockled?

Cockling is an uneven, rippled surface. Moisture changes, wet artistic processes, and mounting conditions can contribute to paper distortion. Some waviness reflects the way the work was made; other cases may accompany water damage or unsuitable housing. Ask about staining, media changes, and mounting as well as the shape of the sheet. Do not try to iron it flat.

Why do conservators photograph a painting in raking light?

Light directed across the surface at a low angle makes surface relief easier to see. It can reveal canvas distortions, raised paint, and other irregularities that are less obvious in evenly lit photographs. Raking light is useful alongside normal-light images, rather than as a flattering sales photograph or a complete condition assessment by itself.

Why can cold-weather transport be risky for acrylic paintings?

Acrylic paint becomes stiffer and more vulnerable to cracking as temperatures fall. A flexible canvas can then move differently from its paint layer, making handling and transport more hazardous. Ask an experienced art shipper how temperature exposure and handling will be managed. Do not assume ordinary packing makes a painting safe in a cold vehicle or loading area.

Every artwork has its own details. For the medium, markings, condition, framing, or shipping of a specific piece, ask the gallery.

The language
of collecting.

Edition markings and print inscriptions tell you more about how a work was made. Use this reference when reading a listing or discussing a piece with the gallery.

Jump to abbreviations

Understanding print proofs

Proofs are prints authorized by the artist in addition to the regular signed and numbered edition. The total edition includes those numbered prints and all authorized proofs. Proofs are generally signed by the artist.

A proof may also have its own numbering: AP 5/20 means the fifth print in a set of twenty artist’s proofs.

Artist’s proofAP / E.A.
A print intended for the artist’s personal use, outside the regular numbered edition. Traditionally, approximately ten percent of an edition may be reserved as artist’s proofs, though the proportion can be higher. The French term is épreuve d’artiste. AP or E.A. commonly appears at the lower left of the work.
Hors commerce proofHC
A print identical to the edition print, intended as a sample for dealers and galleries. These proofs may or may not be signed by the artist.
Printer’s proofPP
A print retained by the printer as a reference. Artists often sign these prints as a gesture of appreciation.

Abbreviations you may see

From the edition number to the names behind the printing process.

2nd ed
Second edition

Prints of the same image as the original edition, altered in some way, such as color, paper, or printing process.

AP
Artist’s proof

A print reserved for the artist; see the proof types above.

Del
Delineavit

Latin for “drew it.” Generally appears next to the artist’s signature.

E.A.
Épreuve d’artiste

The French designation for an artist’s proof.

Exc / Imp
Excudit / impressit

Marks identifying the publisher or printer: “published it” or “printed it.”

HC
Hors commerce

An edition print intended as a sample for dealers and galleries.

Inc. / Sculp
Incidit / sculpsit

Marks identifying the engraver who cut or engraved the master plate.

Inv. / Invent
Invenit

Latin for “designed it.” Generally appears next to the artist’s signature.

Lith. / Litho
Lithographed by

Identifies lithographic production; often appears with the lithograph printer’s name.

Pinx.
Pinxit

Latin for “painted it.” Generally appears next to the artist’s signature.

PP
Printer’s proof

A print retained by the printer; see the proof types above.

TP
Trial proof

An abbreviation for a trial proof.

Markings vary by artist, publisher, and edition. Ask us about the markings on a specific work. Historical inscription meanings can also be explored in the Getty Art & Architecture Thesaurus.

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