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You don't need the Kaolin Clay. It just helps the bath fizzie get rock hard. Corn Starch will help do that too. I got mine from a supplier called Nurture Soap Supply. I buy a lot of my mica and fragrance oils from them for my soaps. But, you can buy it on AMAZON too. Heck.... what can't you buy on AMAZON these days? LOL
Let me know how they turn out :)

Perfect!!! I have corn starch
I'll use ice cube trays since i already use those for dishwasher tablets.
Thanks again for posting