Thanks for that detail. I'm wondering when you said "It depends which one you buy" did you mean which Sodium thiosulfate you buy?
Also, one supplier I've sourced has "Ammonium Thiosulphate, 98%" What does that actually mean compared to
"Ammonium Thiosulphate, 60%"?
The 98% is fine, and would save on shipping, compared to 60%, getting more of it per kg of shipping.