Platinum print

A platinum print has no layer on it. The metal sits down inside the paper fibres, so there is nothing to reflect and nothing to crack. The surface is completely matte from any angle, and the print looks like part of the sheet rather than something laid on top of it.

That is also why the tones run so long. A platinum print holds separation across a far wider range than a silver print, so faint differences survive in the high tones and the shadows keep detail instead of blocking up. The picture looks calm and open, and it has no hard black to anchor the eye.

Set the chemistry in plain terms. The paper carries iron salts and a platinum compound rather than silver. Light reduces the iron, the iron reduces the platinum, and the developer washes the rest away. The metal left behind is platinum, which is why these prints do not fade or silver out.

Set the surface and the tone. Ask for completely matte, no gloss, no coating and no silvering in the shadows. The tone runs from a cool neutral grey to a warm brown black, depending on the developer, so name which end you want. Ask for the paper texture to read through the image, because heavy rag paper is part of the look.

Set the edge. A printer coats the paper by hand with a brush, so the coated area has a brushed border with bristle marks, and the paper sits outside it uncoated. The process needs ultraviolet light and contact with the negative, so the negative is the same size as the print. That is why platinum prints are usually small, and why they are always perfectly sharp.

Use it for a portrait, a nude, a still life or a quiet landscape that has to look expensive and calm. It suits a picture built on soft light and small tonal steps rather than on contrast.

Leave it alone for anything graphic. There is no deep black available, so a silhouette, a hard shadow or a poster like design loses its punch on platinum.

An albumen print is the glossy nineteenth century opposite. It sits on a coating, shines, turns purple brown and yellows at the edges. A platinum print is matte, neutral and stable. If the prompt asks for both, the model averages them into a plain brown photograph.

A gum bichromate print shares the exhibition wall and the same years, but it is pigment in gum, brushed and scrubbed by hand. Platinum is precise. Gum is painterly.

Design publishes Etching and Engraving at /techniques/styles/. Those are line processes, where tone comes from ruled and crossed marks. A platinum print is continuous tone: the greys are smooth, and there is no mark structure to find.

William Willis patented the platinotype in 1873, and the Platinotype Company sold ready coated paper from 1879. The pictorialist societies of the 1890s and the exhibitions of the 1900s made it the serious exhibition print, because it looked nothing like a commercial studio product. The price of platinum rose sharply during the First World War, and the paper left the market around 1916, so printers moved to palladium, which is warmer and slightly softer. Modern makers coat their own paper with a brush and print by contact under ultraviolet light, which is why a hand coated brush edge is normal today.

The model returns a glossy black and white print with heavy blacks. Say the print is completely matte with no coating, the scale is long and smooth, and the shadows hold detail instead of clipping.

The second failure is grain. A platinum print has none, because the image is metal in the fibres, not a suspension of crystals. Say no grain, and ask for paper texture instead.