Quote Originally Posted by Ray Rogers View Post
Hi Jim,

You watched then do this?
How long diid it take between coating and judgment?
After this sort of test, what were their possible moves?

Hi Ray - I did watch them do this. Every 10 minutes or so, they would coat a glass plate with emulsion, expose it with a projection system. and develop (but not fix it). They would bring the plate into the emulsion chemist's office in a box and she would evaluate it quickly after removing the lid in full office light. She whould inspect it for fogging, and color change. Of course, since it wasn't fixed out, she had to work quickly. I'm not sure how long the process took to do, but the important thing was the record of samples 10 minutes apart which were done as the emulsion was sensitizing. Take a look at the attached file.

Regards - Jim Browning