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When mycelium is colonizing for some time, it tends to produce a yellow substance wich is an excretion. I see you're using a tupperware wich is a container bigger than normal for coloniztion, so probably it is taking some time, i wouldn't worry about it. BTW, if you're going to case that tupperware like it is, i would recomend taping the sides and bottom so it doesn't get any light, or you'll be having massive pinning in those places and you don't want that, you just want pinning in the upper side.