Phenidone - reducing agent used in many fine grain solutions.
Phenol varnish - resin used to produce a hard durable top coating.
Hydroquinone, Metol, paraphenylenediamine, and phenidone are some of the more commonly used developing agents. PRESERVATIVE All developing agents in an alkaline state are affected by oxygen.
Common reducers are hydroquinone, metol, and phenidone. AcceleratorThe accelerator is added to the reducing agent to speed development. It also increases contrast.
Developing agents. Chemicals (typically phenidone, metol and hydroquinone) able to change light-struck silver halides into black metallic silver.
MQ/PQ developers
Are developing solutions containing the reducing agents metol and hydroquinone or phenidone and hydroquinone.
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A black & white film or paper developer that includes the developing agents phenidone and hydroquinone.
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TMY is admittedly a difficult film to work with. I prefer to use Ilford Delta 400 film for this reason. My best advice is to use a highly dilute, non-phenidone developer to help with the highlight problems.
The latent image acts as a catalyst encouraging development to take place faster in exposed areas. Development takes place in both exposed and unexposed areas of the film just at different rates.
Developing agents: Metol, Phenidone, Hydroquinone.
 See also: Developer, Film, Image, Hydroquinone, Hydroquinon
  
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