CMS20 runs well (if rather contrastily) in the old Agfa Scala process - the first developer of which seems to be disclosed here , specifically the following:
4.5 g hydroquinone
11.0 g Potassium Sulphite
41.7 g Potassium Carbonate
1.5 g Sodium Carbonate
5.5 g Potassium Hydroxide
2.0 g Nitrilotriacetic acid
1.6 g Potassium Bromide
67 mg Benztriazole
3.8 g. N-methyl-4-aminophenyl-hydrogen Sulphate (metol)
0.4 ml hydroxyethane-diphosphonic acid
1.2 g Polyethylene Glycol, molecular weight 1500
2.0 g Sulphuric acid
made up with water; pH 10.2
There are several interesting aspects, but the main thing to note (which may be important for the successful handling of CMS 20) is that there is no grain solvent, rather there is a development accelerator (the PEG-1500) & that it is an MQ developer (in this form). The problem with a highly monodisperse film like CMS 20 (that may actually have more in common with a paper emulsion than a film emulsion - ie chloride/ high chloride content) is that a solvent developer will effectively act like a weak monobath at a certain point, slowing/ stopping development rather than allowing all the silver to be developed. PQ Universal might make a good starting point, though you may need to experiment with various molecular weights of PEG (not Polypropylene Glycol that some use to mix Pyrocat in) to maximise the effect.
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