Quote Originally Posted by Ian Grant View Post
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.