So it is my understanding that with benzotriazole as a restrainer, its concentration in the pan will decrease with each processed print? Is this correct?
I use it in lith instead of KBr, on the assumption that if I dump and replace half the contents of the tray, then I will have dumped half the amount of bzt I had in there. If the developer was to my liking, I know how much bzt to replace. Br- levels are always increasing, so I have no way of knowing how much to replace.
If bzt levels decrease with use, I guess I have been chasing my tail and gotten lucky from time to time. Is my thinking correct here?
Yes Rich, your thinking is correct. BTAZ concentration decreases along with developing agents, alkali and sulfite. Halides can increase or stay the same depending on developer and paper.
I have a few boxes of Agfa FB that are fogged. Potassium bromide
doesn't help and I can't find Benzotriazole...
Any help appreciated.
Try the Photographers Formulary. It is listed in a banner ad here.
Another source is www.techcheminc.com which sells most common photographic chemicals such as metol, phenidone, KBr, etc.