Queries and Answers: Ambrotypes

Here's another question from an attendee at one of my workshops. "If a daguerreotype is named for Louis Daguerre, then what's the origin of the term ambrotype?" Good question. I have to admit it caught me off-guard. An ambrotype is an image on glass backed with a dark material or varnish. It's named for J. Ambrose Cutting who promoted the process.