Commentary for Niddah 37:51

וממאי דהני טהורין והני טמאין

So it was also taught: Black blood is like the sediment of ink; if it is dark it is unclean, and if lighter, even though it has the colour of stibium, it is clean. And black blood is not black originally. It<span class="x" onmousemove="('comment',' Being originally red. ');">⁴⁶</span>

Explore commentary for Niddah 37:51. In-depth commentary and analysis from classical Jewish sources.