Each of my holders is marked with a simple number on the white area, 1-22 as I have 11 holders. They are all the Fidelity Elite type with the locking slides and the number wheels too. Some people hate them but I like them. I don't care that the numbers go slightly into the image area. It is very slight and I don't crop that close, so I keep the number wheel set to match the number I've written on the outside too, so if I have a problem with fogging or such, film flatness, whatever, with one holder I can identify which one each negative or transparency was shot with.
I keep a notebook of each shot and, though I sometimes neglect to include info I later wish I had, I do at least note when I make each shot and which holder (and side of it) was used, so even if I forgot the reverse the slides, which seems the LEAST likely error to me, I'd still know which were used.
I've never done this though. Of all the possible errors I think this is one I've just never managed. Oh I've put the slide back in the wrong way, with white side out indicating unexposed, but I always noticed it right then and reversed it while in the camera.
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