Authentic Tekhelet, Hand-Extracted from Hexaplex Trunculus

What Is Tekhelet?

Tekhelet (תכלת) is the blue-purple dye the Torah commands be tied into one thread of the tzitzit fringes worn on the corners of a four-cornered garment (Numbers 15:38). For most of the last two millennia, the identity of the source animal — called the chilazon in the Talmud — was lost, and tzitzit were tied with white strings alone.

Over the last century, a body of textual, archaeological, and chemical research has converged on the Mediterranean sea snail Hexaplex trunculus (also called Murex trunculus) as the chilazon — the same species long used to produce Tyrian purple. This has driven a modern revival of tekhelet, led by organizations such as the Ptil Tekhelet Association and supported by the earlier research of Chief Rabbi Isaac Herzog.

One Snail, Two Colors

Tekhelet and Tyrian purple come from the same gland secretion and the same core compound, 6,6′-dibromoindigo. The difference is entirely in processing: when the raw secretion is exposed to light before it fully oxidizes, it photoreduces and settles as blue (indigotin) rather than the deep reddish-purple produced by full oxidation. Ancient dyers — and modern tekhelet producers — control this exposure to choose the shade.

Because Empyrex's pigment and dried glands are hand-extracted from genuine Hexaplex trunculus using historical Mediterranean methods, the same raw material used for tekhelet research and modern tekhelet production is available directly to customers who want to dye their own strings.

Why Source Tekhelet Dye Through Empyrex

Mohamed Ghassen Nouira of Argaman, Tunisia is one of only a handful of living artisans who still hand-extract Murex dye using traditional methods — breaking, extracting, and processing genuine Hexaplex trunculus glands rather than synthetic substitutes. Empyrex is his exclusive North American distributor, and every order ships with provenance documentation and an artisan-signed certificate of authenticity.

Frequently Asked Questions