James Ambrose Cutting patents improvements to the wet collodion (Ambrotype) process

Background. The ambrotype is a positive photograph on glass created via a variant of the wet plate collodion process. While Frederick Scott Archer invented the underlying collodion method, James Ambrose Cutting is often credited with the ambrotype due to his 1854 patents. These patents specifically addressed improvements in chemical preparation, composition, and sealing techniques for glass images, rather than the fundamental concept of the collodion positive itself.

Patent Claims. Cutting's three patents, awarded in July 1854, focused on specific technical enhancements. The first two patents covered improvements in the chemicals and handling used in the collodion process. The third patent described a method for sealing finished collodion images beneath a layer of glass using balsam, a technique known as Cutting's Patent Ambrotype.

Terminology. Although Cutting named the process after himself, historical records suggest the term "ambrotype" may have been coined in the gallery of Marcus Aurelius Root. Root documented this in his 1864 book, noting that Cutting and Isaac Rehn introduced the process to various establishments in 1854, though the exact year the term was first used remains unspecified.