The Radzyners and Breslov wear a different color of techelet than the religious zionists: theirs is made from a squid, which was researched by the Radzyner Rebbe, Gershon Henoch Leiner in the 1800s. Later, in the early 1900s, Rav Yisroel Herzog, who was the chief Rabbi of Ireland, decided that the techelet comes from the Murex Trunculus snail. Even today, you can see people wearing both colors, which are visibly different. The Murex Trunculus techelet is considerably more expensive.
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