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Excerpt from A Handbook of Photography in Colours In the year 1839 Sir John Herschel published the first of an important series of papers on various photo graphic processes. A paper published in 1840 (philosophical Transactions) deals with the coloured image of the spectrum (showing red, green and blue) obtained on chloride of silver paper he discusses the question of producing photographs in natural colours. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.