Traité pratique de phototypie ou impression à l'encre grasse sur une couche de gélatine 1879

"Traité Pratique de Phototypie" is a book published in 1879 by Léon Vidal, a prominent figure in the world of photography. This book, published in Paris, explores the process of Phototypie, a printing method utilizing a gelatin layer and greasy ink. The cover features a photograph of the Cité de Carcassonne, a fortified medieval city in Southern France. Vidal's book serves as a valuable resource for anyone interested in the history of photography and the development of printing techniques.