Quote Originally Posted by Photo Engineer View Post
You may be using up or absorbing some contaminant. IDK, but I have had that before in some situations where a photo active ingredient is present at a very low concentration and is used up.
That's a good, plausible explanation Ron. Some sort of compound is formed during mixing then reacts with the paper emulsion. I've come to believe that its a quirk of amidol that has to be lived with.