Commentary for Niddah 39:42

אמר רב יצחק בר אבודימי

Then why did it mention only black? — As it might have been presumed that, since R. Hanina stated, 'Black [blood] is really red blood that had deteriorated', it should, therefore, be unclean even if it is lighter, hence we were informed [that IF LIGHTER IT IS CLEAN].

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