Read a discussion on wearing of Tallit and Tzit Tzit, regarding the blue dye needed to make these, and the necessity for it to be come from a snail like creature. However the Word of God does not specify this specific dye, only the blue color.
Numbers 15:37-41 – “Adonai said to Moshe, "Speak to the people of Isra'el, instructing them to make, through all their generations, tzitziyot on the corners of their garments, and to put with the tzitzit on each corner a blue thread. It is to be a tzitzit for you to look at and thereby remember all of Adonai's mitzvot and obey them, so that you won't go around wherever your own heart and eyes lead you to prostitute yourselves; but it will help you remember and obey all my mitzvot and be holy for your G_d. I am Adonai your G_d, who brought you out of the land of Egypt in order to be your G_d. I am Adonai your G_d.”