Right David. That applies to all developers IMO. Make sure the chemistry is all settled out, run two or three prints to make sure, or two or three blank pieces of paper.
My point is that I've seen the pink stain sporadically with what's probably the best amidol that can be obtained. I wonder what it was like in years past when amidol was produced by more sources and in much larger quantities?
Here's the kicker question: Did Weston have this problem? (no debate initiation intended ).