How to safely buffer an ammonium dichromate solution?

Question

I am looking into how the pH of dichromated gelatin is affected after exposure to light in an attempt to selectively transfer acid fixing dyes to paper. I would like to raise a 10% solution of ammonium dichromate to pH 7, but I am not sure what buffer would be most effective and safe.

Any insight?

Answer 1

(NH4)2Cr2O7 and NH4OH buffer.

Answer 2

I do not what is the pH of the ammonium dichromate solution but have you tried using phosphates as buffers? I do not know if they will affect your process.

Just a suggestion.

Good luck!