Response to PMK and Rollo Pyro

Can't help you on the grit, but Rollo Pyro is a variation of PMK. If I remember correctly, Dick Sullivan claims that PMK oxidises too fast in JOBO drums. This reduces the developer's abiity to produce stain. So he came up with this formula. It is basically PMK with additional Sodium Borate. Keep in mind, it is only meant to be used in drums. For trays, stick to normal PMK.

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