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My jars are about two weeks old and are colonizing fast. I started with six and threw two out early on. Recently (past 3 days) two more jars showed signs of a small dime size greenish blue mold. I bleached a spoon and cut out the contam, but 24 hours later, small bits reappear just outside where I cut. What is the best way in keeping the contam. from returning?
Cutting out mold is never easy, and there is no sure fire way to get rid of it once it's established itself. If these were very precious jars, the best thing to do is let the mycelium get as far as it can before cutting out the mold, that way you're not going to spread the mold to un-colonized substrate. It's best to not even mess with it this early in the process, just PC another batch. It's easy to spread the stuff around while manipulating it, not really worth it considering there's only a chance it will end up fruiting. Mold is only slightly easier to combat in later stages, i.e. after the mycelium has a foothold.