Ammonium thyocyanate vs ammonium thiosulfate

[wildbillbugman]

Hi PE,
I have read your old posts concerning optimal evals of hypo. Do you also hare a preference for determining optimum evals of ammonium thyocyanate and ammonium thiocyanate + Au ?
Bill Winkler

 

[wildbillbugman]

Sorry, I meant ammonium thiosulfite.

 

[wildbillbugman]

No. I meant what I wrote inn the first place. Duhh. I am not a morning person.

 

[Photo Engineer]

Bill, although you can use either Ammonium Thiocyanate or Thiosulfate as a chemical sensitizer, the Thiocyanate tends to keep better. Thiosulfate tends to decompose.

However, if you use either as a fixer, then the Thiosulfate is suggested as the Thiocyanate can cause gelatin swelling and reticulation.

Thus, intended use can determine which to use.

PE

 

[wildbillbugman]

PE,
My question was really about sensitization, not fixing. But you have answered my question. Thanks
Bill