With the printed negative in hand, Lvov coated cotton paper with a mixture of platinum salts and various other components to make the substrate sensitive to ultraviolet (UV) light. The coated paper and negative were then sandwiched together in a vacuum frame and exposed to UV light, causing the reduction of the platinum salt back to its metallic state based on the level of opacity from the negative, forming the images. The final prints offer a superior range of gray ... anny blatt
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