Originally Posted by
Greg Blank
Sorry, is simply poor information. Pyrogallic acid as a component of Pyro developers being one of the oldest and newest developers is toxic to humans in powder form. If you do not research how to handle the powder and are careless.
However once mixed the developer is akin to "Tea" or other tanic acids. The Pyro gallic acid originally was derived from the "Galls" found on oak trees. In liquid form the spent developer can be flushed down the drain if you have a septic system.
Because it readily oxidizes and returns to rather safe organic state once discarded.
Whereas hydroquinone based developers can not. Some people love Xtol some hate it. I have no real good results with it, YMMV.
If your interested in Pyro you should read Gordon's book!
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