Reference for Niddah 41:34

כי פליג רבי יהודה אאדומה ושחורה ואירוקה ולבנה לא אלא ירוקה ולבנה למאן קתני לה

if there was blood with it, she is unclean, otherwise she is clean. R. Judah ruled: In either case she is unclean. Now does not this present a difficulty against Samuel in one respect and against R. Johanan in two respects? 'Against Samuel in one respect, since Samuel stated, 'R. Judah declared the woman unclean only where the shapeless object had the colour of one of the four kinds of blood' whereas here 'green and white'<span class="x" onmousemove="('comment',' Which are not of the four unclean kinds. ');">²⁹</span>

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