Only recently have we found ways to get blue Tekhelet dye from Murex Trunculus. Rav Herzog was told this isn’t possible.

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The Chilazon according to our sages was the source of the blue Tekhelet dye needed for the commandment of Tzitzit. Rabbi Herzog’s initial assumption was that the Murex Trunculus mollusc is the Chilazon. According to Baruch Sterman a new correspondence … Continued