precipitation of dichromates

Do any of you chemists out there know why potassium dichromate would
precipitate out of solution when alcohol is added vs. ammonium dichromate
which doesn't? Could it just be potassium's lower saturation point that
makes it seem that way or is there a property of alcohol that makes a
potassium form do this whereas an ammonium form doesn't? Or is this even
true in your observations, and from a practical standpoint, at what point?
Any conjecture would be appreciated.

My reason for asking this is just thinking about the addition of alcohol in
a coating solution in gum printing that has been suggested in the past, to
make it thinner and easier to coat, whether this is viable with potassium
dichromate.
Chris
Received on Tue Feb 24 11:42:14 2004