I don't allow mixing. I've been to busy to make play-dough lately so I bought a batch of 24 colors. It's nice to be able to know what color you're going to get by looking at the cover. I also have some kids that would get VERY upset to have brown play-dough when they were expecting green or pink!
Some of you do have me thinking though-maybe I am being a little ocd? Mixing colors most definitely would be a learning and creative opportunity! Maybe I'll have to have a talk with the kids and let them help decide what our play-dough rules should be.

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