I think that the black and green swirled because i slid them on the insert instead of layering them the way i had planned. The insert I made was to small so I had to race to prevent the different 1/2s from combining. I was thinking about next time doing the white 1/2 one night and then the black and green the next. but part of me is afraid that they wont stay together if i do it that way. Oh yeah I forgot to mention that I scented it with eucalyptus and white thyme. (which smells amazing btw)