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THE DAFYOMI DISCUSSION LIST
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Rosh Kollel: Rabbi Mordecai Kornfeld
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Menachos 043: Janthina
hg schild asked:
I thought I heard that someone made a "good" dye from them recently. What
chemical structure was this? The same indigo family as Murex or ???
hg schild, ny
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The Kollel replies:
We are not that familiar with any recent developments.
However, when we covered the Sugya in Menachos, we were in touch with Saul
Kaplan, Ph.D., who says that he has produced a steadfast blue dye from the
Janthina (which he catches himself), in his home laboratory in Rechovot. He
kindly sent us a Janthina shell to prove to us that its color is blue. You
can read about his findings in Levi Kitrossky's article at
<www.tekhelet.com/kitrossky/tekhelet.htm> (seach for "Kaplan" to skip to
the relevant section), where he discusses your question concerning the
color of the Janthina dye. You can also see Kaplan's own website at
<www.realtekhelet.com> .
I hope this was helpful for you.
Y. Shaw
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