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In February we conducted a thorough discussion of the mitzvah of techeilet. The following guest piece by Baruch Sterman, marking 20 years since the establishment of the Ptil Tekhelet Foundation (www.tekhelet.com), is a follow up to that discussion.
Techeles, the blue strings the Torah requires Jews to wear on their ritual tzitzis garments, has long been thought of as a "dead" mitzvah. Sometime in the 7th century apparently (possibly due to the Arab conquest of Israel) Jews stopped producing techeles strings and the identity of the chilazon, from which the blue dye originates, was subsequently lost.