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Welcome to Edgar Angelone, Photography Black and white photography in gelatin silver and platinum prints by Edgar Angelone fine art photographer of landscapes, still life, photojournalism. Studio: 2154 4th Street San Rafael California, 94901 (415) 457-3237 Platinotype is a monochrome photographic printing process based on the light-sensitivity of ferric oxalate. Ferric oxalate is reduced to ferrous oxalate by UV-light. The ferrous oxalate then reacts with platinum (or palladium) reducing it to basic platinum which builds up the image. William Willis discovered the process in 1873, and the first platinum paper reached the market in 1881. It was produced by the Platinotype Company, a firm founded by Willis in 1879. When Willis invented the process, platinum was relatively cheap, but it quickly became more costly starting in 1906. In 1907 platinum had become 52 times more expensive than silver. Eastman Kodak and most other producers stopped fabrication of the paper in 1916. Russia controlled 90% of the world platinum supply in World War I, and all available platinum was used in the war effort. Due to the shortage of commercial paper and high cost, photographers experimented with palladium paper and platinum-palladium mixes. Platinum paper has continued in use until the present, interrupted only by the world wars. Due to the unavailability of pre-coated sensitized paper, all platinum/palladium (Pt/Pd) printing is done on paper coated by the artist. The light sensitive chemicals are mixed from powdered basic chemicals, or some commercially available solutions, then hand applied with a brush or a cylindrical "pusher". Many artists achieve varying effects by choosing different papers for different surface characteristics, including vellum, rag, rice, among others - even silk. On the collecting market, Pt/Pd photographic prints often sell for many times more than a similar silver-gelatin print. By varying the ratio of Pt to Pd and the addition of oxidizing chemicals such as hydrogen peroxide and potassium dichromate or potassium chlorate, the contrast and "colour" of the final image can be modified. Because of the non-uniformity of the coating and mixing phases of the process, no two prints are exactly the same, adding additional "cachet" to a Pt/Pd print. This process has an inherent low sensitivity because the ferric oxalate is sensitive to ultra-violet light only, thus specialized light sources must be used and exposure times are many times greater than those used in silver-based photographic processes. Characteristics: There is nothing quite like the glow of a genuine platinum print. It is simultaneously gentle and powerful, it is subtle yet rich and luxurious, and it has a physical presence like no other print medium. Home

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