Reference for Chullin 109:16

כל שיעורי חכמים להחמיר חוץ מכגריס של כתמים להקל

And there is, indeed, a support for this ruling; for the following has been taught as a comment [upon that Mishnah]:<span class="x" onmousemove="('comment',' In Kelim XIX, 2. V. supra p. 298, n. 6.');">⁸</span>

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