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29-01-2021
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In 1847, Louis-Desire Blanquart-Evrard discovered that soaking paper in emulsion rather than brushing it on made the paper

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02-02-2021

Explanation:

Salt-print pessimistic method was researched by Louis-Desire Blanquart-Evrard, would become the first individual in France to report negative/positive print picture processes in 1847. Instead of rubbing these industrial treatments on the floor, he developed a technique of soaking the document in potassium permanganate and silver nitrate formulations.

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