MSDS only list ingredients with safety concerns and should be assumed to be incomplete. The form (powder, liquid concentrate, or dilute solution) may also influence what ingredients are listed.
The MSDS for D76 lists:
- Sodium Sulphite (antioxidant/silver solvent)
- Hydroquinone (developing agent and/or regenerative agent for metol)
- Bis(4-hydroxy-N-methylanilinium) sulphate (developing agent, aka metol)
Likely missing is something for pH adjustment such as sodium/potassium hydroxide as well as various pH buffers.
The same for F76+ (described as a phenidone developer) lists:
- Potassium metabisulphate (inhibits bacteria)
- Sodium hydroxide (pH adjustment)
- Hydoquinone (developing agent and/or regenerative agent for phenidone)
Phenidone is not on the list, probably due to its relatively low toxicity. Sodium sulphate is almost assuredly an ingredient as well along with pH buffers.
The two formulae may be equivalent for most purposes without being chemically identical. Difference will show at or near the point of exhaustion, with high dilutions, and/or temperatures other then recommended. Therein lies the question of suitability for push processing and also the raw edges of what I know about this stuff. For a long discussion of the matter, this thread on the Digital Truth forum might be helpful to those who are patient.
Hydroquinone with Metol and Phenidone. - Digitaltruth Photo
Also useful might be the information on developers in Ansel Adams' "The Negative". An inquiry to Freestyle regarding suitability of F76+ (or Arista Premium Liquid, their brand for the Clayton product) for push processing might also bear fruit.
Steve