How old is my painting?

Which clues show how old a painting is?

The strongest dating clues are "not before" limits: materials, products and subjects that only existed after a known date. Style and craquelure suggest an age but are easier to imitate.

• Support

  Hardboard (Masonite) dates from the mid-1920s onward. Commercial canvas boards became common in the late nineteenth and twentieth centuries. Hand-woven linen is typical before the mid-1800s.

• Fixings

  Hand-forged nails, then machine-cut tacks through the nineteenth century, then wire nails, and staples on canvases mostly after about 1950.

• Supplier stamps

  Colormen's stamps with dated addresses, and printed labels from twentieth-century art stores, give date ranges that can be checked in published directories.

• Pigments

  Prussian blue appeared in the early 1700s, synthetic ultramarine in the late 1820s, and titanium white became common only around 1920. Identifying pigments needs a conservator's analysis, but the results are decisive.

• Subject details

  Fashion, hairstyles, uniforms, vehicles, buildings and street furniture all date a scene: a painting cannot be older than the newest object it shows, unless it was imagined.

• Style

  Styles have dates of origin (Impressionism from the 1870s, Cubism from about 1908, Abstract Expressionism from the 1940s), but painters kept working in older styles for decades, so style gives a lower limit more than a date.

• Paint handling and tools

  The collapsible metal paint tube, patented in 1841, made outdoor oil painting practical, and thick, rapidly applied plein-air sketches became far more common afterwards. Acrylic paints were introduced commercially in the 1950s and spread widely in the 1960s, so a painting in acrylic is almost certainly from the second half of the twentieth century or later.

Keep two kinds of date apart: the date the painting was made, and the dates of things that happened to it later. A painting can be made in 1860, relined in 1920, reframed in 1965 and restretched with staples in 1990, and every one of those events leaves its own materials behind.

How do you date a painting step by step?

Collect every clue, convert each into a date range, and find where the ranges overlap. The overlap is your most defensible date.

1. Inspect the back and construction

   Record the support, stretcher, fixings and any relining. Each has a typical date range.

2. Read labels and stamps

   Research supplier, framer, gallery and exhibition labels. Dated exhibition labels and dealers' records can give exact years.

3. Check the signature for a date

   Many artists dated their works next to the signature, sometimes abbreviated ("'94"). Check the date is consistent with the materials.

4. Look for dating details in the image

   Clothing, technology, architecture and transport set a "not before" date.

5. Compare the style with dated works

   Use museum collections filtered by date and country to see when similar handling and compositions were current.

6. Combine the ranges

   Write each clue's range in a list and find the overlap. If one clue contradicts all the others, re-examine it; it may be a later replacement such as a new stretcher or frame.

7. State the date the way a catalog would

   Express the result honestly: "dated 1912" when the artist wrote it, "about 1890" or "circa 1880 to 1900" for an estimate, "late 19th century" for a broad range. Precise wording keeps an estimate from being mistaken for a documented fact.

How do dating clues work together?

Dating is a matter of overlapping evidence. These examples show how different clues combine into a defensible date.

• Style versus support

  A Romantic mountain landscape in an early nineteenth-century manner is painted on hardboard. The support sets a date after the mid-1920s, so this is a later work in an earlier style.

• Supplier and subject agree

  A Parisian street scene shows horse-drawn omnibuses and gas lamps, and its canvas carries a Paris colorman's stamp from the later nineteenth century. Both point to about 1880 to 1900.

• A date in the signature

  A coastal view signed and dated 1912 is on a commercially primed canvas with a keyed stretcher and machine-cut tacks, all consistent with the inscribed date.

• A replaced stretcher

  A seventeenth-century-style portrait has a modern stretcher with staples, but the canvas is hand-woven linen with an old relining. The stretcher dates the last restoration, not the painting.

• Fashion dates a portrait

  A woman's sleeves, hairstyle and neckline in an unsigned portrait match fashion plates of the late 1830s, giving a narrow date range that a style comparison alone could not.

What are common mistakes when dating a painting?

Dating errors come from relying on a single clue, especially appearance, and from not noticing later replacements.

• Dating by darkness and dirt

  Dark varnish and grime are easy to add. They show neglect, not age.

• Dating by style alone

  Painters worked in earlier styles throughout the nineteenth and twentieth centuries, and copies were made at every period.

• Dating by the frame

  Frames are often replaced. A period frame on a later picture, or vice versa, is common.

• Ignoring restoration

  New stretchers, relining canvases and retouching all add modern materials to old paintings. Separate the original from later interventions.

• Trusting a written date without checking

  Dates written on the back may be the date of purchase, framing or a later guess. Treat them as clues to test.