Probably spelling it wrong or might not be close but a duragotype? Made by a French guy I know that, he used to work in theater I think so maybe a lighting thing
Camera Obscura ( latin? for "dark box") first used to capture scenary, then for an artist to draw and paint later
O I think part of my ACT was on that. There was a section with a brief history and some people argued that it helped the artist where others say it desensitized the public to the true thing. (Picture of the Grand Canyon so people arent as amazed by it in person)