Chiba Type-A Non-Toxic Alternative to Gum Dichromate

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  • 千葉方式 -重クロム酸塩ゴム印画法に代わる毒性のない写真法

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Abstract

The historical photographic printing system gum-dichromate or “gum printing” is used worldwide by artists and in art based photography education. It utilises the highly dangerous chemicals dichromate and often formaldehyde. Here we present two alternative methods for making “gum prints” with gelatine or gum arabicum. These are based on free radical polymerization with ammonium ferric citrate as sensitizer. The gelatine-based process is simple, using hydrogen peroxide as developer, the gum-based process includes ammonium persulphate in the photosensitive layer and has therefore problems with a “dark reaction” Our process also avoids hardening of the substrate, by a modified work path.

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