In “A Practical Manual of the Collodion Process,” S. D. Humphrey presents a comprehensive exploration of the collodion wet plate process, a pivotal technique in 19th-century photography that transformed image-making. The book meticulously details the chemical methods, equipment, and practical applications necessary for mastering this demanding craft. With a clear, didactic style, Humphrey employs step-by-step instructions, complemented by illustrative examples, making the manual not only a guide but also a historical artifact that captures the essence of a period marked by innovation in visual technology. The work situates itself within the broader context of Victorian science and art, addressing both amateur and professional photographers eager to delve into the intricacies of collodion photography. S. D. Humphrey, an ardent practitioner of photography and a skilled technician, often drew from his background in chemistry and visual arts to illuminate the complexities of photographic processes. His dedication to teaching and the dissemination of photographic knowledge led him to compile this manual, reflecting not just his expertise but also the communal spirit of photographers of his era, eager to share insights and techniques that would ensure the preservation of this remarkable process. This manual is highly recommended for enthusiasts, historians, and practitioners of photography alike. Its practical insights combined with historical context provide a rich resource for understanding both the technical aspects and artistic implications of the collodion process. Whether you are a novice longing to capture the past or an experienced photographer seeking to rekindle lost techniques, Humphrey's work is an indispensable addition to your library.