The formula for commercial Neofyn Blue (original spelling) has changed originally it was just Metol, now it's Metol with a small amount of Hydroquinone according to the MSDS.
Ilford's high definition developer Hyfin contained Glycin, others a small amount of Pyrocatechin or Meritol (a fusion of Pyrocatechin and p-phenyldiamine).
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