Tekhelet

A blue dye by the Hebrew name tekhelet, (Hebrew: תכלת‎, alternative transliterations: tekheleth, techelet or techeiles) is mentioned 50 times in the Hebrew Bible (Tanakh), and translated by the Septuagint as hyakinthinos (Greek: ὑακίνθινος, blue). Its uses include the clothing of the High Priest, the tapestries in the Tabernacle, and the tassels (Hebrew tzitzit) to be affixed to the corners of one's garments. Following the destruction of the Temple in Jerusalem by the Romans, the sole use of the blue dyed strings was in the tzitzit. Tzitzit are tassels composed of 4 strings for which Rabbinic Judaism offers three opinions as to how many are to be blue: 2 strings; 1 string; 1 half string.