Commentary for Niddah 37:44
כתיב (ויקרא יד) קיר
which indicates that blood is red.<span class="x" onmousemove="('comment',' As red is the usual colour of blood, all blood which has one of the five colours enumerated in our Mishnah (all of which are shades of red) is unclean. ');"><sup>39</sup></span>
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