Elanorya

Photography guide

Photographing hallmarks and stamps

Every other photograph on a listing is judged on how it looks. This one is judged on whether the characters can be read. That is a different kind of pass mark, and it changes the lighting, the framing and what counts as good enough.

There is nothing there to photograph

A printed mark would be easy: ink is a different colour from the surface it sits on, so any reasonable light records it. A stamped mark has no such advantage. The tool pushed metal aside; what remains is the same metal, the same colour and the same finish as everything around it.

So there is no tone to capture. The only thing that distinguishes the mark from the surface is its shape — and shape becomes visible in a photograph only when part of it is darker than the rest. That darkness has to be manufactured, and the thing that manufactures it is the direction the light comes from.

The necklace guide sets out the mechanism properly, and it holds here without modification: relief is read by shadow rather than by highlight, and direction, not softness, decides whether a shadow exists at all. What follows is what changes when the point of the photograph is that someone can read it.

Which way the light has to cross

A character is a groove. Whether it shows up depends on how the light meets it, and that is decided by the strokes rather than by the piece.

A character stroke shown as a narrow groove. In the first, light travels along the groove and both walls are lit. In the second, the same light crosses the groove and one wall falls into shadow.12

  1. Light along the stroke

    The beam runs the length of the groove and reaches both of its walls at a similar angle. Both walls return a similar brightness, nothing separates the groove from the surface, and the character reads as if it were not there.

  2. Light across the stroke

    The same source, moved so it crosses the groove, lights one wall and leaves the other in shadow. That shadow is the character. This is why the raking angle has to be chosen against the direction of the strokes, not against the shape of the piece.

A document, judged like one

Most listing photographs are judged on a sliding scale. A slightly flat chain shot is a worse photograph than a well-lit one, but it is still a photograph of a chain and it still sells the piece. Nothing about it fails outright.

A mark photograph does not work like that. It exists so that a buyer can check something you said in the description. If the characters cannot be read, it has not done its job at all — and an attractive, well-composed, beautifully lit frame in which the mark is invisible has failed completely while looking like a success.

That is why this frame should be shot separately and checked differently. Do not judge it by looking at it; judge it by reading it, at full size, from the file you are about to upload. And remember that you already know what it says, which makes you the least reliable reader it will ever have.

Before you publish the frame

Five checks. Only the last one is about the photograph.

  • The light crosses the strokes rather than running along them.
  • Characters running in a second direction have their own frame.
  • Nothing has been added from the front to fill the shadow.
  • You can read the characters from the exported file at full size.
  • The mark frame is published alongside the beauty frames rather than instead of them.

What this page does not cover

  • What any particular mark means. Assay systems, maker identification and dating are outside what this site has sources for, and nothing here should be read as a claim about them.
  • Focus and depth of field, which are covered separately — the sharp plane and the aperture trade-offs each have their own page.
  • Whether a mark is genuine. A photograph shows shape; it does not authenticate.
  • Numbers. No angles, distances or magnifications appear here, because no measured source is recorded for them.

Questions

Why can't I get my hallmark photo to come out readable?

Almost certainly the light is arriving from the front. A stamp is displaced metal with no colour of its own, so it is visible only as shadow — and frontal light fills the depression evenly, removing the shadow that made it readable in the first place.

Which direction should the light come from?

Across the strokes rather than along them. A character is a narrow groove: light travelling along it lights both walls and the groove vanishes, while light crossing it lights one wall and shadows the other. If the characters run in two directions, that is two frames.

Can I just use the same photo I use for the listing?

Usually not. The lighting that makes a piece look good is close to the opposite of the lighting that makes a mark readable, so one frame attempting both tends to fail at both. Shoot the mark separately and publish it alongside.

Is it acceptable to edit the mark to make it clearer?

No. This frame exists as evidence for something you claimed in the description, so editing it into agreement with that claim removes the only reason it was worth publishing. Light it correctly instead.