Reference for Niddah 38:37

ולימא

WHAT COLOUR IS REGARDED AS RED? ONE LIKE THE BLOOD OF A WOUND. What is meant by LIKE THE BLOOD OF A WOUND? — Rab Judah citing Samuel replied: Like the blood of a slaughtered ox.<span class="x" onmousemove="('comment',' The true colour of red. Cf. Yoma 56b. ');">³⁴</span>

Jastrow

Jastrow

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