Pyrocat-MC uses Pyrocatechin as staining developer, just like Pyrocat-HD, but combines it with Metol and Ascorbic Acid (vitamin C) instead of Phenidone.

Pyrocat-MC is a new staining B&W developer, formulated by Pat Gainer and Sandy King and based on Sandy’s Pyrocat-HD, that is made up as a stock solution in propylene glycol. The stain itself is orange or yellow in colour and is somewhat opaque to the light used for making prints, which has the effect of smoothing out grain during printing. In addition, the stain is often very opaque to UV light, making stained negs very useful for printing in platinum or other iron-based processes, which are sensitive to UV.