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5

I don't know if they address this concern particularly in terms of the expense. However, the knowledge that murex indigo is chemically identical to plant-based indigo is something knowable only in the 20th and 21st century, when we know about atoms, molecules, and chemicals. If plant-based indigo failed the gemara's test for fastness, and this was just a ...


3

Actually, the Rebbe, Rabbi Menachem Mendel Schneerson, did give a response which can be found in his Igrot Kodesh when he was asked in the 1960's (might have been early 1970's). He said that he had nothing to add to the response of the Rebbe Rashab, Rabbi Shalom Dovber Schneersohn, on the question. The Rashab was asked specifically about the Radziner ...


2

This requirement is stated in the Tosefta and Meseches Tzitzith Tosefta Menachoth 9:16 "תכלת אין כשרה אלא מן החלזון הביא שלא מן החלזון פסולה." Tekheleth is only valid from the חלזון ; if one used a dye not made from the חלזון it is invalid.” מסכת ציצית פרק א הלכה י שאין צובעין תכלת אלא בחלזון. We only dye תכלת with a חלזון from: ...


2

How are the tzitzit made? One begins from the corner of a garment - i.e., the end of its woven portion. One ascends upward no more than three fingerbreadths from the edge, but no less than the distance from the knuckle of the thumb to its end. [A hole is made] and four strands inserted, [causing them] to be folded in half. Thus, there will be eight ...


1

You cite the Sifre Bamidbar 115 which states: ועשו להם ציצית שומע אני יעשה חוט אחד בפני עצמו ת"ל גדילים מכמה גדילים אתה עושה אין פחות משלשה דברי בית הלל ובית שמאי אומרים שלשה של צמר ורביעית של תכלת והלכה כבית שמאי But if you look at the Sifre Devarim 234, the other place in the Torah that talks about Tzitzit, it says: גדילים תעשה לך, למה נאמר לפי ...


1

The relevant statement is in his Pirush HaMishnayos 4:1: ואינו נמצא בידינו היום לפי שאין אנו יודעים לצובעו שאין כל מין תכלת בצמר נקרא תכלת אלא תכלת ידועה שאי אפשר לעשותה היום ועל כן אנו עושים בלבן לבדו And [Techeiles] is not found in our hands today because we do not know how to die it because not all types of Techeiles in wool are called Techeiles ...


1

According to הרב מאיר הלוי הלמן - לבוש הארון (modern English sefer on Techeiles), on page 21: The color of murex dye was commonly known as “Tyrian Purple”, as the city of Tyre (today in Lebanon) was the leading center for purple dye production. Murex dye had “great brilliance and fastness in comparison with other known dye”. These qualities, as ...


1

I have two hypotheses: 1) If a major rav were to come out with a clear psak in favor, or just start wearing techelet publicly himself, it would be a whole lot to carry on his shoulders. As far as I know, most poskim are hesitant to tackle the question at all. Even Rav Moshe Karp was staunchly opposed to wearing techelet, but when one of his sons came home ...



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