<p>In תוס' כתובות ה: ד"ה דם מיפקד פקיד, Rabbeinu Tam says that דם חלזון is not the the regular life-force blood, and therefore there's no איסור of נטילת נשמה involved in extracting חלזון juice. It doesn't seem to be a קושיא that the Murex's hypobronchial fluid isn't "blood" in the classical sense.</p>
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Author: False == 1 ? Anonymous : Levi Goldman #44;
<p>In תוס' כתובות ה: ד"ה דם מיפקד פקיד, Rabbeinu Tam says that דם חלזון is not the the regular life-force blood, and therefore there's no איסור of נטילת נשמה involved in extracting חלזון juice. It doesn't seem to be a קושיא that the Murex's hypobronchial fluid isn't "blood" in the classical sense.</p>