Pyrocat M will give very similar results to Pyrocat-MC. It is essentially identical to -MC but is mixed in water instead of glycol and contains sodium metabisulfite which is replaced functionally by ascorbic acid in -MC. Pyrocat M uses the same Stock B solution as -HD and -MC
Compared to Pyrocat-HD you should see a tad more acutance when developed with rotary processing (Jobo, BTZS tubes, etc). Film speed is slightly less than -HD but you probably won't notice the difference.
I am not sure how long the stock solution of Pyrocat M will last but you are probably safe with six months in a partially full bottle.
Sandy King
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