Reference for Niddah 42:7

המפלת חתיכה אדומה ושחורה ירוקה ולבנה אם יש עמה דם טמאה ואם לאו טהורה

whose benefit then was green and white mentioned? If it be suggested: For that of the Rabbis [it could be retorted]: Since the Rabbis declared the woman clean even in the case of red and black blood, was it any longer necessary to state that the same law applies also to green and white? Must it not then be conceded that these were mentioned for the benefit of R. Judah who,<span class="x" onmousemove="('comment',' Since he ruled, 'In either case she is unclean'. ');">⁷</span>

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