Hi Juan, I am virtually certain that the restrainer (KBr) quantity is the variable.Quote:
Originally Posted by juan
I mix all my chemistry with 18 megaohm deionized water (continuous quality monitoring) so that shouldn't be a factor.
I made a mass spectrometer run on a sample of the Glycin powder and it is the real stuff - high purity, too.
I mixed my Ansco 130 (and my PPPD) without KBr. I developed several work prints and observed high developer activity and warm tones (warmer than the MS Amidol).
Then I added 6 ml of 10% KBr to the Ansco 130. The developer activity slowed down and the tones went to blue/black (deep blacks - very nice). The prints have a lot of visual "snap."
I expect that if I use 2ml of 10% KBr per liter of working solution Ansco 130 I will get a warmer toned image than the MS Amidol. According to the literature, I can lower also the contrast with Ansco 130 by increasing the dilution.
Time for a second round of tests!