Parashas Metzora · Passuk 14:42
Chabad.org — English translation + Rashi
Torah Temima points to Toras Kohanim.
English: “Other dust” — “other” includes even bricks, even clay, even potsherd-dust; one might think even lime or gypsum, therefore it says “its dust.”
Permitted plaster materials
Chazal expand the permitted replacement plaster to various earth-based materials while excluding pure lime and gypsum.