Reply To: Techeiles 🔵❎🐌☑️🐟

“as for not using expensive things as a ziyuf, what about hamotzi bashuk, because al kol ponim murex was heavily used, so you have to be choshesh that it is murex. besides if it isn’t kla ilan, rav achai should still be choshesh for it.”

The gemara says that it’s only kosher if the wool was tied which indicates that it was made for tzitzis. Now if you find blue wool made for tzitzis you can assume that the guy didn’t use murex trunculus to dye tzitzis. Now let’s say that the guy who put in in the shuk had himself found it there not tied as tzitzis. Why would he make it into tzitzis considering that he cannot ascertain whether it was dyed with murex or with techeiles and he can’t ascertain whether or not it was dyed lishma. It’s muchrach miney ubay that we’re not choshesh for this, because if we were then you could never use techeiles found in the shuk. So therefore if you find blue strings in the shuk there would never be a problem, even if murex trunculus is not real techeiles.