Reference for Niddah 44:11

אמר ריש לקיש

— Rabina replied: The practical difference between them is [an abortion that can be] crushed by the exercise of pressure.<span class="x" onmousemove="('comment',' But cannot be dissolved by mere immersion in lukewarm water. According to the first Tanna, since lukewarm water cannot dissolve it, it cannot be regarded as blood, while according to R. Simeon b. Gamaliel, since it may be squashed by pressure, it must be regarded as blood. ');">¹¹</span>

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