Craft Smart® Natural Clay is rated 3.5 out of 5 by 73. Rated 1 out of 5 by Crafts77 from Very brittle!! I used this to make christmas ornaments.
Crayola Air-Dry Clay, White, 5 Pound Resealable Bucket Natural Clay for Kids, No Baking, Dries Hard, Easy to Paint, A Smoother, Simpler, Less-Sticky Alternative to Traditional Ceramics. by Crayola. $9.30 (41 new offers) 4.1 out of 5 stars 529.
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In this free eBook, you will learn: What calcium bentonite clay is; Who can safely use calcium bentonite clay; How clay works and how to use it; When it’s appropriate to use clay
Natural clay might have small stones, organic material or anything else in it. Any of these can and will decrease the likelihood of success for your ware during the firing, and organic material is worse because it leaves a void in the clay, and might make enough steam to blow up the piece.