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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 ...


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: ...


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 ...



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