Commentary for Niddah 124:23

רביעית דם שנבלע בבית הבית טמא

R. Johanan raised an objection against Resh Lakish: IF ONE IMMERSED IT AND, HAVING HANDLED CLEAN THINGS ON IT, APPLIED TO IT THE SEVEN SUBSTANCES AND THE STAIN DID NOT FADE AWAY, IT MUST BE A DYE; AND THE CLEAN THINGS REMAIN CLEAN AND THERE IS NO NEED TO IMMERSE IT AGAIN.<span class="x" onmousemove="('comment',' Now if it be granted (with R. Johanan) that an absorbed uncleanness, though it emerges under certain special conditions, is treated as clean, the assumption here that the stain was one of dye and, therefore, clean is well justified; for even though it was blood it would (being absorbed) convey no uncleanness. But if it is maintained (with Resh Lakish) that even an absorbed uncleanness, wherever it would emerge under certain conditions, conveys uncleanness, how could the law be relaxed in this case where the possibility of blood cannot be ruled out? ');">²⁰</span>

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