Re: Gum variables

FotoDave@aol.com
Wed, 10 Jun 1998 10:41:21 -0400 (EDT)

Pot. dichromate saturates at around 12%. You have been using the right salt
all along. :)

I am using Pot. just because I bought the cheaper of the two when I started
and still have it around.

>> In the meantime, I have a question for the gumbies/chemists out there. I
know
the saturation values of the various dichromates differs, that ammonium
dichromate saturates around 28% (I think) in solution. I've always thought
that this salt was better in terms of printing speed (don't know where I read
that one), but isn't potassium dichromate more concentrated in a saturated
solution, and if so, wouldn't this salt be better in terms of maintaining a
higher viscosity emulsion and thus minimizing the stain problem? Maybe I've
been using the wrong salt all along. Is potassium dichromate best suited for
the process? >>