Originally Posted by Ian Grant
Would you buy it as R09 from Calbe and sell it as Gainerol
There's an interesting cemical called "Oxygen Scavenger" which is sold by a bulk photographic chemical supplier.
I've never seen it in any published formulae but it's sold in liquid form in sizes up to 1000 litre IBC's - Ammonium Bisulphite
You would not want to put Ammonium Bisulfite into a developer! It is great in fixers though.