Finished a printing session last night and this morning when the prints were dry I noticed that the edges of the last print I made/fixed shows a slight discoloring around the edges. About 1/4" all the way around the print, the edges are slightly creamy colored instead of white. I think I was pushing the limit on that batch of fixer. Does it sound like that is what happened on that last print that the fixer got used up? Used TF5 fixer and 130 developer with Ilford MFGB Warmtone paper. If the fix was expired, can I just take that print and re-fix it?