4 Swelling and non swelling clays

What’s the difference beetwin those two powder (they are both clays powder).

What’s the point with those behaviour ? Generally, the more swelling is the clay, the more sticking it is.
But if you consider that to obtain a plastic paste (same state as a pizza paste) you need to add 2 or 3 times more water in a clay than in the second one, what happens while drying ?

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Retractation due to evaporation of water induce, for pure clay paste, cracks. Cracks in dry non swelling clays are thin when the ones in dry swelling clays are tremendous !

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