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#1
December 4th 09, 05:59 PM
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Metol, Phenidone & Hydroquinone.
Most B&W developers contain Hydroquinone with either Metol or Phenidone or a Phenidone derivative. Both Metol and Phenidone are super-additive with Hydroquinone, so why add both of them in the same developer formula?
Here is an example of a developer which contains all three of those constituents. http://www.tetenal.com/sidaopener_uk...auk/100152.pdf 
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