I am in the process of researching how to make TF-3 in the Darkroom Cookbook and it calls for a 60% solution of Ammonium thiosulfate.
I looked on all the obvious photo chemical websites and it appears that it is sold in liquid form at the 60% solution.
I was wanting to make my own 60% solution from dry chemicals so I could mix it and my TF-3 on demand. I don't like to have pre-mixed chemicals sitting around if I can avoid it because I never know when or how much I will need.
Does anyone know how to make the 60% Ammonium thiosulfate from dry chemicals? I searched for Ammonium thiosulfate in dry crystal form, but not having much luck.
I am wondering why all these suppliers are selling it as a pre-mixed 60% solution? There must be a reason that I don't understand, so any help is appreciated.
Thank you!
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