Abstract
Abstract The search for a method of obtaining pictures without the aid of a brush was conducted for a long time by scientists and inventors in different countries. As early as 1725, a young Russian amateur chemist, who was studying the preparation ofliquid medicines, made a remarkable observation: solutions of iron salts changed their colour under the action of sunlight. This chemist was Aleksei Petrovich Bestuzhev-Ryumin, who was to become Chancellor of the Russian Empire. Two years later, similar experiments, but with silver salts, were conducted by the German scientist Johann Heinrich Schulze. Such observations stimulated keen minds to undertake a search for ways and means of ‘fixing’ the imprints made by light.
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