I don't thnk pressure itself would cause that effect. "Newton's Rings" are caused by light intereference from its passage through a very small and uneven space. It could be very noticeable when magnified from a negative, but I don't ever remeberr seeing it from, say, a piece of glas laid on top of a piece of printing paper.Originally Posted by inthedark
More and more I would suspect Color Developer holdover. The *only* place I use shortstop now is in RA-4 processing. I seem to remember random staining, without using shortstop, that closely resembled your description. Adding a stop bath fixed the problem.
I would suggest cold storage of color paper. I place a few sheets - estimating the number I'll use immediately, and the rest goes back into the freezer. I think color paper is more sensitive to aging than film.
Uh ... where are you located?