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yesterday comment added uhoh OK I will give some thought to sodium thiosulfate - is the effect catalytic (i.e. a small amount goes a long way) or is there some proportion (e.g. M/M) that I should be thinking of? (btw by "loosely covered" I meant placing a watch glass (those concave things) over the beaker to minimize evaporation loss, anyway "neutralizing" the peroxide is preferred)
yesterday history answered Buttonwood CC BY-SA 4.0