Quote Originally Posted by PGum View Post

The question then is: Does DAS have an "acidic environment" requirement?

Peter Friedrichsen
Hi Peter,

Short answer: as far as my tests go, no it doesn't. I have used it with casein in the same way as I do with dichromates: mix the sensitizer just before use. I have not yet incorporated it directly. But sensitized sheets keep very well. After 3 days I see no difference in sensitivity or any stain. The speedball stuff is probably a diazo and this is not the same as DAS.
DAS does not work with gum arabic.

I keep my DAS 3% solution in a brown bottle in the dark, but outside the fridge. It keeps very well in my observation.

kees