Excerpt from Studio Light, 1917, Vol. 8 On the introduction of the wet plate, a more aggravated form of halation was encountered, due to the reflection of light from the back Of the glass support to the under side of the emulsion. This, however, was not as great as the halation of the dry plate, for the color of the iodized collodion emulsion of the wet plate acted as a filter and cut out much of the light which would otherwise have been reflected. 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.