Sorting through my 4x5 B&W negs I find that I have exactly 3 negs that have a si ngle wide notch with rounded bottom corners. Sorta like Plus-X minus the two sma ll notches. It's not round like Ilford Ortho+ but had a flat bottom.
I shot these pics in '83 when I was shooting almost exclusively Tri-X. (obviousl y not every time!)
I cannot find that pattern in any of my references.
What is this mystery film?
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