| I keep offering information from the previous millenium. I think that is what I know best. When I was young (1950's) the five & dime stores sold packages of cartoon character negatives and a few small pieces of POP. We would expose in bright sunlight under glass (not furnished). It seems like there was a common household product that was used to "fix" the image to a limited degree, but the images lasted only a few days or weeks as I recall. Secondly, I remember that portrait studios made proofs on POP because they were cheap and not long lasting. |