Reference for Pesachim 90:21

וכן לענין טומאה אם מקפיד עליו חוצץ ואם רוצה בקיומו הרי הוא כעריבה:

Our Rabbis taught: [With regard to] the trough of tanners<span class="x" onmousemove="('comment',' Into which they put hides for tanning.');">¹⁸</span> into which he put flour,<span class="x" onmousemove="('comment',' Which is used in the tanning process.');">¹⁹</span>

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