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There are some people that wear Tcheiles - blue Tzitzis. What is the reason that the majority of Klal Yisroel still does not wear it if the Tcheilas has been rediscovered?

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possible duplicate of Why is techeles not universally accepted? – simchastorah Dec 21 '11 at 6:38
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@simchashatorah. Technically, this is the older one. I think they should be merged together.. – HodofHod Dec 21 '11 at 6:42
ok so flip it i am unsure how to do that – simchastorah Dec 21 '11 at 6:43
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@IsaacMoses I don't know of the precedents but I vote beauty before age. Why don't you put the issue up on meta.J.SE? – Double AA Dec 25 '11 at 19:46
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@IsaacMoses Have we reached a conclusion? – Double AA Apr 3 '12 at 21:17
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4 Answers

up vote 3 down vote accepted

Here are short and long versions of an excellent class on the topic that goes through many arguments pro and con (with the speaker having an overall pro bias).

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Please make your answer more informative by summarizing the relevant arguments from the two sources you cited. – WAF Jul 6 '11 at 21:59
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Just saw this! Mod fight! ;) – HodofHod Dec 25 '11 at 18:28
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@HodofHod, Except that I upvoted WAF's comment. I just haven't gotten around to re-listening and summarizing. – Isaac Moses Dec 25 '11 at 19:04
@IsaacMoses. Awwwwww. Shucks! ;) – HodofHod Dec 25 '11 at 19:09

The Gemara (Bava Metzia 61b) speaks pretty harshly about "one who attaches kala ilan [indigo] to his garment and claims that it's techeiles." Since, as Shalom noted, the identity of techeiles is in fact uncertain (I've heard of at least three different opinions what creature it comes from), that may be reason enough to avoid using what might be the wrong stuff.

There is also a Kabbalistic idea (from the Arizal) that techeiles is not needed after the destruction of the Beis Hamikdash, and that it will be restored only when Moshiach comes.

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Then what is the basis of those that do wear it? – Gershon Gold Oct 15 '10 at 2:40
Bottom line: Until proven otherwise, it's a safek deoraita. There's a lot to say in both directions, but I think you really need a rationale not to more than you need a rationale to. Here are short and long versions of an excellent shiur on the topic: yutorah.org/lectures/lecture.cfm/746207/Rabbi_Aryeh_Lebowitz/…Should_One_Wear_Techeiles? yutorah.org/lectures/lecture.cfm/746226/Rabbi_Aryeh_Lebowitz/…-_Should_We_Wear_It? – Isaac Moses Oct 15 '10 at 4:08
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Safek deOraisa implies that you should wear the techeiles so you can fulfill the mitzva. The mishna (hebrewbooks.org/shas.aspx?mesechta=30&daf=38&format=pdf) tells us you are yotze anyway. That brings down the stakes somewhat. – YDK Oct 15 '10 at 14:08
@Gershon: because they hold that the stuff they use is indeed the right one. Same as any other case where there are variant opinions in halachah. – Alex Oct 15 '10 at 15:22
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Isaac, the opinion of the Rosh, that wearing any other color in the Tzitzis besides for the Lavan and Ticheiles invalidates the mitzvah could throw the safek di'oraisa in the opposite direction and leave us with shev v'al taaseh just in case it is not really t'cheiles (or the correct shade of t'cheiles.) – Yahu Oct 17 '10 at 4:25
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http://hebrewbooks.org/pdfpager.aspx?req=31622&pgnum=403

Thhe Rebbe Rashab wrote to R' Leiner (The original re-discoverer of techeiles [even though he was found to have been fooled by the scientists of his day, yet the reasons of the Rebbe Rashab still apply to the modern day tcheiles.]).

The Rebbe Rashab writes that it cannot be the real tcheiles because the Alter Rebbe writes in Likkutei Torah (in the name of the Pri Aitz Chaim) that there is no tcheiles in the time of exile because it represents a high spiritual level that we cannot reach in the time of exile.

This is similar to the rule that we do not blow Shofar on Rosh Hashana that falls out on Shabbos because of the Gzeira of Rava (we are afraid one will carry it in the street to learn how to blow it.) However, in Kabbalah it's explained that we don't blow shofar on shabbos because we can't reach the level of Shofar (whatever the shofar would accomplish shabbos already does). It is explained in Chassidus that the real reason for not blowing the shofar is because of the Kabbalistic reason, but in order not to make rulings based on only kabbalah, the gemarah gives a reason (although seemingly forced) of the gzeirah of Rava.

So too here, we can't reach what Tcheiles represents in exile, therefore, we shouldn't wear it, and the simple reason is because people may put it on a linen garment (tzitzis with tcheichles (wool) can be put on a linen garment) but we are not sure that it is real tcheiles, so we don't wear tcheiles at all.

The Rebbe Rashabs also asks that if the only reason nobody wore tcheiles was because of expenses, why were there no exceptionally pious people who would try to get a hold of it at all costs, like people tried getting Esrogim at all costs even when there were wars, etc.

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I do not understand the "people may put it on a linen garment" argument. Does this not apply equally to a tzitzis without t'cheles such that people should not put them on at all for fear of attaching wool strings to linen garments? – WAF Jul 6 '11 at 22:02
People know the problem of shaatnez, but because tcheiles could go on linen garments, they may think it's real tcheiles and do it. As the letter mentions, the main reason is really the Kabbalistic reason, and this is like the "Gzeira D'Rava", a technical excuse for the Kabbalistic reason. – Shmuel Brin Jul 6 '11 at 22:18

Many believe that once the mesora (tradition) was lost, it was lost; modern scientific methods can't restore mesora. (The fact that there are different forms of tcheiles today doesn't help.)

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I believe this is the approach of R' Chaim Soloveitchik (or perhaps the Beis HaLevi or the Brisker Rav, I don't recall). – Dave Oct 31 '10 at 20:05

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