Commentary for Niddah 112:20

אינו דומה כתם שלאחר הכבוס לכתם שלפני הכבוס שזה מקדיר וזה מגליד

that it was made after the previous washing,<span class="x" onmousemove="('comment',' For if it had been there before the previous washing it would have faded in the course of that washing. Hence the uncleanness is retrospective to the time of the previous washing only. ');">¹⁹</span>

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