When Exactly Was Techeiles Lost? November 18, 2021 – י״ד בכסלו תשפ״ב by HyehudiParsha Talk – Teruma 5781 – 04 – How Tekhelet got LostMar 12, 2021Rabbi Avi Grossman interviews Dr. Baruch Sterman on Tekhelet.From YouTube, here.