Antique Paintings: Attribution, Signatures, and Value Guide

Direct Answer: Five Things to Check on Any Painting

First, the SIGNATURE — location (lower left or right is normal), style (compare to known examples), medium (oil paint on top of the picture or scribed into wet paint or added later in different paint). Second, the CANVAS WEAVE — 17th- and 18th-century canvases are usually hand-loomed with visible irregularities; 19th-century canvases are mill-woven and more uniform. Third, the STRETCHER BARS — hand-cut keyed wooden stretchers (1800s and earlier) versus machine-cut keyed stretchers (mid-1800s+) versus modern stapled construction (20th c.). Fourth, the GROUND — old paintings show oxidation and craquelure (network of fine cracks) consistent with age; a 'too clean' surface is suspicious. Fifth, the BACK — old paintings accumulate dust, labels, stamps, inscriptions, and stains. A pristine back on an 'old' painting is a red flag. None of these is conclusive alone; together they triangulate authenticity and date.

Reading Signatures

A signature can be (a) genuine and from the painter, (b) added later by someone else with knowledge of the work, (c) added later by someone forging an attribution, or (d) genuinely the painter's but added long after the work. A genuine in-the-paint signature is applied with the same paint and brushwork as the rest of the picture and shows the same crackle pattern at the same age. A 'pop-in' signature added later sits ON TOP of the oxidized varnish and shows fresh-looking paint without aged craquelure. Always cross-reference the signature against published catalogue raisonné entries for that artist; many artists used distinctive flourishes or initials that are well documented. BE WARY of attribution to famous 18th- and 19th-century European artists — these are the most-forged signatures. American Hudson River School signatures and American impressionist signatures are also frequently faked. Cheap reproductions sometimes have printed 'signatures' that show no brush texture at all under magnification.

Canvas, Stretcher, and Frame Dating

Hand-loomed canvas (pre-1830 typical) shows irregular weave under raking light, with knots and slubs visible. Mill-woven canvas after the 1830s is more uniform. The selvage (woven edge of fabric) on early paintings shows hand-loom irregularities, while later canvas selvage is straight. STRETCHER BARS evolved: pre-1800 paintings often have nailed wood without keys; KEYED STRETCHERS (with corner wedges that allow re-tensioning) appear from the early 1800s. Hand-cut wooden stretchers show saw marks consistent with hand sawing; machine-cut bars (post-1840s) show smoother, uniform cuts. STAPLED construction is 20th c. and absolutely modern. FRAMES are a separate dating question — many 19th-century paintings sit in 20th-century frames after re-framing — but PERIOD frames carved with Empire, Gothic Revival, or Aesthetic Movement details add value when original to the painting.

Craquelure and Surface Tells

Genuine aged oil paint develops CRAQUELURE — fine networks of cracks in the paint and varnish layers. The pattern varies with the painting's support (canvas, panel) and ground, but generally shows fine, branching cracks that don't extend uniformly. FAKED craquelure produced with solvent or by baking shows uniform, geometric cracks that look too regular — like crackle glaze on a ceramic. OXIDATION of varnish layers produces the yellow-brown tone of old paintings; modern paintings have clear varnish. PENTIMENTI (visible underpainting where the artist changed a composition) can be seen under raking light and indicate genuine painting process (which prints and reproductions cannot show). REPAINTING and RESTORATION is detectable under UV light, where modern overpaint fluoresces purple-blue while old paint fluoresces green-yellow.

Provenance and Documentation

Provenance is the documented chain of ownership from the artist to the current owner. Robust provenance is what turns a credible attribution into an actual one and substantially raises value. KEY DOCUMENTS include: artist's catalogue raisonné entry, exhibition catalogues mentioning the work, auction records, dealer stickers and labels on the back, family inheritance documentation. STICKERS AND LABELS on the back of an old painting are valuable historical evidence — exhibition stickers, dealer stickers (Knoedler, Wildenstein, Macbeth), and old auction lot stamps all contribute. A painting with detailed provenance that traces back to the artist's studio or to a known early collection is worth far more than the same painting with no documented history. For high-value works, third-party authentication by the artist's foundation, catalogue raisonné editor, or recognized expert is often required.

Conservator vs Restorer vs Cleaner

PROFESSIONAL CONSERVATION (cleaning yellow varnish, stabilizing flaking paint, careful inpainting in damaged areas using reversible materials) is acceptable and often necessary for older paintings. OVERZEALOUS RESTORATION (extensive overpainting, removing original layers, replacing damaged sections) reduces value and authenticity. OUTRIGHT REPAINTING (covering large areas of original paint with fresh paint to 'improve' appearance) is fraud-adjacent. A painting with substantial overpainting still 'reads' as the original artist's work to a casual viewer but UV examination reveals how much modern paint covers the original. For valuable paintings, condition reports and conservation history should be available and reviewed before purchase. AVOID self-cleaning antique paintings — solvents and household cleaners damage varnish and paint irreversibly.

Authentication With Valued

Snap photos of the painting front, the back, the signature in close-up, the canvas weave, the stretcher bars, and any labels or inscriptions. Valued analyzes signature against known examples, dates canvas and stretcher by construction, identifies craquelure pattern, reads any dealer or exhibition labels, and produces an attribution confidence rating with a value range. It flags signature additions, UV-detectable overpainting, and stretcher inconsistencies. This content is for educational purposes only and does not constitute appraisal advice; high-value attributions require in-person expert authentication.

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