Quote Originally Posted by htmlguru4242
Ah, the sodium dichromate I have is part of the Kodak Tray Cleaner, which consists of sodium dichromate and sulphiric acid in an aqueous solution. (It is designed for cleaning trays in automatic processors, though I use it for reversal processing as a bleach). What I'm saying is that I'm not sure how the Sulphuric acid will affect the dichromate in the solution; the bleach is quite acidic so I don't know what would happen if it's mixed with, say, gum of casein for one of the alternative processies.
That's what I thought you menat. Don't used tray cleaner for gum or casein printing. Ammonium or potassium dichromate is fairly cheap (though not equivalent in gum printing), so just purchase some of that and save the tray cleaner for trays.

Don Bryant