Upon occasion holding temps outside hit a range when mold will grow. My batch of 6 year first rinse developed a nice mold coating over the past week before I could get to it.
Of course you can strain or float the mold head so you can pour off the dyestock. Below I am pouring off and floating the mold. You can pull it off with a rag or let a filter capture it. Purely personal choice…..and your yuck tolerance level.
The color on the right below is what the 6 year madder 1st rinse that had the mold growth yielded on my wool. The middle skein is a disappointment, more on that substratein another entry. The white skein on the left was just added. All three are going back into the 6 year exhaust pot to see what color shows up.
Besides the disappointing yarn, I have some tannin silks to show, here’s a preview of the colors that were overdyed. What do you think madder root did to these colors? 
debmcclintock 
I’m betting they’re gorgeous! Madder overdyes on almost *anything* are good. Can’t wait to see the results.
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I have a jar of mouldy madder soaking outside right now! You’ve cheered me up no end!
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