BRUNEL, Georges || FORESTIER, E. La Pratique en photographie avec le procédé au gélatino-bromure d'argent. [v. 1890].

First edition.
Book mainly focused on the collodion process.

followed by :
GANICHOT, Theoretical and practical treatise on the retouching of negative and positive proofs, Paris, Charles Mendel, [v. 1890]
112 pages (missing the half-title).
Long before Photoshop, retouching images has always been at the heart of the art of photography.