Alan7140

Thornton Pickard "Imperial" half plate camera, Apo-Rodagon 9/360, Ilford MG IV paper neg.

Back around 1973 I used that film a lot, processed in Rodinal 1:100, 22-25 minutes @ 20°C, 1 minute agitation @ 5 secs each. Fog levels were always high, even with fresh film, but the grain and soft tonal gradation was unique and is something I do miss these days.

Your best clue was the bit about "I did see a lot of purple dye come off and when I opened the tank after fixing, there was still a lot of dye coming off and it was still very pink." The film never was in developer in that case. Fixing an undeveloped T-Max 100 film produces exactly that symptom - plenty of dye in the fixer solution and it's almost impossible to remove the pink look from the negative no matter how long you fix the film.

Probably has a nitrate base and quite likely perished or extremely brittle by now. It's very flammable, too, if that's the case.