This book contains classic material dating back to the 1900s and before. The content has been carefully selected for its interest and relevance to a modern audience. Carefully selecting the best articles from our collection we have compiled a series of historical and informative publications on the subject of photography. The titles in this range include "A Guide to the Chemistry of Photography" "A Guide to the Carbon Printing Process" "A Guide to Celestial Photography" and many more. Each publication has been professionally curated and includes all details on the original source material. This particular instalment, "Chemical Toning" contains information on the chemistry of photographic development. It is intended to illustrate aspects of chemical toning and serves as a guide for anyone wishing to obtain a general knowledge of the subject and understand the field in its historical context. We are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork.