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It seems odd that something like the tradition for techeles could have been lost. It seems unlikely that Jews just stopped using techeles at some point and then immediately forgot. Are there no records of how the dye was made?

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See the Tshuva of the Satmar Rebbe – sam Jun 25 '14 at 19:51
how and where can I find this? – yid Jun 25 '14 at 19:53
My understanding is that it was out of fashion because it was too expensive. Once you can't afford it, no one makes it, and the memory gets lost ... – Yishai Jun 25 '14 at 23:38
Related: judaism.stackexchange.com/q/38503/5323 – Shokhet Jun 26 '14 at 2:27

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