Techeles tzitzis

Rav Sternbuch (I #26) Question: Is it best to wear the recently rediscovered techeles in tzitzis? The Radziner Rebbe claimed to have rediscovered the fish which he thought was the source of the dye for techeles in tzitzis  As is well known this was not universally accepted by rabbinic authorities even as a requirement to avoid doubt. It was accepted by his chasidim. Others claim that the correct fish is different. There are even some in Radzin that claim the Rebbes techeles is wrong.There is a young man a baal tesuva who wants to know whether he should wear this techeles Answer Your main question as to whether this techeles is the real techeles, I am not able to clarify. In reality it was only actually known with certainty in the period of Tannaim and then its identity was lost and will remain uncertain until the Messia is revealed. I don’t think we know today its true identity and this is attested to by the Arizal. In conclusion only if the collective Rabbinic authorities agree is there a binding halacha or even a strictness from doubt. At the present time, wearing it simply causes disputes and thus is prohibited. However it is permitted for Radziner Chasidim to wear it in their community. In addition it might be prohibited because of the prohibition not to add a mitzva not stated in the Torah and claim it is a Torah mitzva even because of doubt. . The Radziner asked.  we have a ruled that for a doubtful Torah law we take the strict view to eliminate doubt so why not in this case? The Brisker Rav said this is only when we fulfill the Torah Law because of doubt.But in this case we are not certain that we are actually doing the mitzva. 

Rav Sternbuch (IV #5) Question: What is the status of techeles today? Answer The Radziner Rebbe claimed to have rediscovered the fish which he thought was the source of the dye for techeles in tzitzis. As is well known this was not universally accepted by rabbinic authorities even as a requirement to avoid doubt. There are clear sources that its true identity was concealed by G-d until Moshiach comes. In fact the Brisker Rav noted tacheles requires a clear tradition which is the reason that in most generations there was no attempt to rediscover it. .Without a tradition there is not even a concern for doubtful techeles and there is a clear problem of bal tosif.  The bottom line is I can not recommend using any one of the claimed techeles. It is best to follow the standard practice and wait until it is revealed in the time of Moshiach.  

Rav Sternbuch (VI #3) Question: What is the status of techeles today? Answer It is not clearly known and the majority of rabbinic authorities have not accepted any of the suggested alternatives. In fact there are sources that clearly state that G-d has concealed its identity until the coming of Moshiach. Even to wear it from doubt, there is a problem of bal tosif . In sum until the [oskim clearly agree what is techeles there is no obligation to wear it even from doubt.