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The process of Platinum printing, which has remained unchanged to this day, is based upon the fact that certain ferric salts can be reduced to the ferrous state when exposed to light rich in ultraviolet radiation, and these ferrous salts can further reduce the platinum salts to metallic platinum. Thus, paper coated with an aqueous mixture of platinum chloroplatinite (and /or sodium palladium chloride) and ferric oxalate, is allowed to dry and the paper then contact printed beneath a negative of the same size as the desired image under sunlight or an ultraviolet light source.
