[pure-silver] The fate of a batch of Pyro
My understanding of the active ingredients in pyro developers is that some of them have very short lifespans. The instructions with WD2D+ indicate that you should mix the developer within about 2 minutes of use. 

I have always assumed that oxidation is killing the developer.

Is this so?
And just how 'harmless' does pyro become after being exposed to oxygen for, say, 30 minutes? Has it now converted enough of its toxicity (to some other compund?) to dump down the drain?
If not, is there a compound that can be added to it (in tiny quantity) to render it safe to dump? 

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