Treated with or containing bichromate; especially referring to photographic materials or processes that used bichromate compounds.
From 'bichromate' plus the past participle suffix '-ed'. This term describes the state of being treated with bichromate, reflecting the chemical processes of 19th and early 20th-century photography.
Bichromated gelatin was the secret sauce of early color photography—when exposed to light and then treated carefully, it could capture colors that no film could match until decades later!
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