Stability in alkaline environment?
I found that the speedball diazo sensitizer looses all of its sensitivity in less than a 1/2 hour in an alkaline casein emulsion but I don't have specifics on pH, only that this alkaline environment has this effect. From what I understand, the pH reducing phosphoric acid in this particular speedball sensitizer is necessary for stability but this is not compatible with casein.
The question then is: Does DAS have an "acidic environment" requirement? Does anyone know of its stable working pH range?
Also, can a working solution of DAS in water be stored in the fridge for later use?
Last edited by PGum; 01-23-2013 at 06:32 AM. Click to view previous post history.