This has been a useful discussion. Some of the cobwebs are starting to clear a bit. Orders were of course for a series of slides covering a theme (or custom set). Orders were filled from stock supplies of slides. When a particular item was running low we would pull that neg and make more slides. When I got new neg to shoot, I would clean and mount the neg, then fire off maybe 10 shots. My supervisor would develop the film and look for color balance and problems (like dust, scratches, etc.). When all was good I would shoot some number of copies based on whether or not the item was popular or not. Film was developed and slides made. Anyway, we must have used filters to balance the color. Also, I'm sure each neg had a corresponding starting values for filtration. Often no changes were made from the test run - or so I feebly recall.
I wonder what happened to all those negatives. Thousands of them.
I wonder what happened to all those negatives. Thousands of them.