Mishnah Brurah on Rice
Section 453: Laws Concerning the Wheat and Concerning the Grinding of Wheat for Matzos
Even if a person kneads rice flour and the like with steaming hot water and covers it with cloths until it expands like leavened dough, this does not mean that the rice dough has become leavened, but that it has decayed, and it is therefore permitted to be eaten on Pesach.
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