Traité pratique de photographie au charbon : complété par la description de divers procédés d'impressions inaltérables : ohotochromie et tirages photomécaniques 1877

This book, "Traité pratique de photographie au charbon", published in 1877, is a guide to carbon photography, a method of creating photographic prints that are known for their permanence. Authored by Léon Vidal, a respected photographer, the book delves into the techniques for creating these durable prints as well as other photomechanical methods, including photochromie. It explores the history of photography and the art of creating images using coal, providing valuable information for photographers and those interested in the history of this art form.