A Practical Manual of the Collodion Process, Giving in Detail a Method For Producing Positive and Negative Pictures on Glass and Paper.

"A Practical Manual of the Collodion Process" by S. D. Humphrey is a handbook from the 1800s designed to teach photographers the collodion process. It explains how to make both positive and negative photos using glass and paper. The book dives into specific methods like ambrotypes and discusses the chemistry involved in photography. It emphasizes the importance of light and how it works in cameras while highlighting the manual’s beginnings as part of a larger scientific journal for enthusiasts looking to learn reliable techniques for the photographic arts. Think of it as a step-by-step guide, carefully explaining the art and science behind creating pictures.