I just made a bunch of prints last night and this morning I took them out of the darkroom. When I got home from work they all had turned a brownish color. I was using LPD developer and TF-4 fixer. I've not had this problem before. What could be the cause? I have check my safelight. I was using Ilford RC pearl paper. I'm thinking maybe the fixer was bad? I followed the instructions and fixed for 1 min with constant agitation.

