Commentary for Bava Batra 37:15

אטו מי לא קתני אמת המים וקתני נברכת הכובסין

The Mishnah here mentions flint stones, and the same rule applies to sand, and there it mentions sand and the same rule applies to flint stones. Said Raba to him: If his neighbour telleth concerning him, should not the Mishnah mention the whole list in one place and only one item in the other, allowing us to understand that the same rule applies to the rest? No, said Raba. The reason why flint stones are not mentioned in connection with Sabbath is because they are liable to crack the pot,<span class="x" onmousemove="('comment',' Or 'make rusty'. They are therefore not used at all, whereas purple wool is used sometimes. ');">¹²</span>

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