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A set of tzitzit, four fringes or "tassels" with blue threads produced from a Hexaplex (Murex) trunculus based dye

Tekhelet (Hebrew: תכלת‎, "turquoise"[1] or "blue";[2] alternate spellings include tekelet, t'chelet, techelet and techeiles) is a blue dye mentioned 49[3][4] times in the Hebrew Bible/Tanakh. It was used in the clothing of the High Priest, the tapestries in the Tabernacle, and the tassels (Hebrew: ציצית, tzitzit [tsiˈtsit], pl. tzitziot) affixed to the corners of one's four-cornered garment, such as the tallit (garment worn during prayer).[3]

According to the Talmud, the dye of tekhelet was produced from a marine creature known as the ḥillazon (also spelled chilazon).[2] According to the Tosefta (Men. 9:6), the hillazon is the exclusive source of the dye.

After the destruction of the Temple in Jerusalem by the Romans, the sole use of the tekhelet (blue) dye was in tzitzit. A tzitzit is made of four strands, a number of which be tekhelet, which Rashi describes as green as “poireau,” the French word for leek, transliterated into Hebrew. There are three opinions as to how many are to be blue: 2 strings;[5] 1 string;[6] 1 half string.[7] These strands are then threaded and hang down, appearing to be eight. The four strands are passed through a hole 25 to 50 mm away from the corners of the four-cornered cloth.

Tekhelet is mentioned in the third paragraph of the daily prayers known as the Sh'ma Yisrael (Hebrew: שְׁמַע יִשְׂרָאֵל; "Hear, [O] Israel"), citing BamidbarParshas Shelach (Book of Numbers 15:37–41).

Biblical references[edit]

Of the 49[8] or 48 [3][4] uses in the Masoretic Text, one refers to the whole nation of Israel (Numbers 15:37–41), 44[citation needed] refer to the priesthood or temple. The remaining 6[citation needed] in Esther, Jeremiah and Ezekiel are secular uses; such as when Mordechai puts on "blue and white" "royal clothing" in Esther. The colour could be used in combination with other colours such as 2 Chronicles 3:14 where the veil of Solomon's Temple is made of blue (tekhelet), purple (Hebrew: אַרְגָּמָן argaman) and crimson (Hebrew: כַּרְמִיל karmiyl). Ezekiel 27:7 may indicate the source of the shellfish to have been the Aegean region.[9]


At some point following the Roman exile of the Jews from the Land of Israel, the actual identity of the source of the dye was lost, and during a period of over 1,300 years, Jews have only worn plain white tassles (tzitzit).[10]

The stripes on prayer shawls, often black, but also blue or purple, are believed to symbolize the lost tekhelet which is referred to by various sources as being "black as midnight", "blue as the midday sky", and even purple.[11] These stripes of tekhelet inspired the design of the flag of Israel.

Identifying the ḥillazon[edit]

A guide from the Ptil Tekhelet Foundation shows how a piece of wool, dipped into the solution for the Hexaplex (Murex) trunculus based dye, turns into leek-like green in sunlight, and eventually into (dark) blue with a purple hue.

Various molluscs have been suggested as the ḥillazon, the source of the blue dye.[12] None have been universally accepted, though the Murex, Murex trunculus, known by the modern name Hexaplex trunculus is currently thought to be the most likely source of the biblical blue dye.[13][14][15]

Sepia officinalis[edit]

In 1887, Grand Rabbi Gershon Henoch Leiner, the Radziner Rebbe, researched the subject and concluded that Sepia officinalis (common cuttlefish) met many of the criteria. Within a year, Radziner chassidim began wearing tzitzit dyed with a colorant produced from this cephalopod. Some Breslov Hasidim also adopted this custom due to Rebbi Nachman of Breslov's pronouncement on the great importance of wearing tekhelet and in emulation of Rabbi Avraham ben Nachram of Tulchyn, a prominent Breslov teacher who accepted the view of his contemporary, the Radziner Rebbe.[citation needed]

Rabbi Yitzhak HaLevi Herzog (1889–1959) obtained a sample of this dye and had it chemically analyzed. The chemists concluded that it was a well-known synthetic dye "Prussian blue" made by reacting Iron(II) sulfate with an organic material. In this case, the cuttlefish only supplied the organic material which could have as easily been supplied from a vast array of organic sources (e.g., ox blood). R. Herzog thus rejected the cuttlefish as the ḥillazon and some suggest that had the Grand Rabbi Gershon Henoch Leiner known this fact, he too would have rejected it based on his explicit criterion that the blue color must come from the animal and that all other additives are permitted solely to aid the color in adhering to the wool.[16]


Within his doctoral research on the subject of tekhelet, Herzog placed great hopes on demonstrating that Murex trunculus was the genuine snail ḥillazon. However, having failed to consistently achieve blue dye from Murex trunculus, he wrote: “If for the present all hope is to be abandoned of rediscovering the ḥillazon shel tekhelet in some species of the genera Murex and Purpura we could do worse than suggest Janthina as a not improbable identification”.[17] Although blue dye has in the meantime been obtained from Murex trunculus snail, in 2002 Dr. S. W. Kaplan of Rehovot, Israel, sought to investigate Herzog's suggestion that tekhelet came from the extract of Janthina. After fifteen years of research he concluded that Janthina was not the ancient source of the blue dye.

Murex trunculus[edit]

In his doctoral thesis (London, 1913) on the subject, Rabbi Herzog named Murex trunculus as the most likely candidate for the dye's source. Though M. trunculus fulfilled many of the Talmudic criteria, Rabbi Herzog's inability to consistently obtain blue dye (sometimes the dye was purple) from the snail precluded him from declaring it to be the dye source.

According to Zvi Koren, a professor of chemistry, tekhelet was close in color to midnight blue.[18] This conclusion was reached based on the chemical analysis of a 2000-year old patch of dyed fabric recovered from Masada in the 1960s.[19] The sample, shown to have been dyed with Murex snail extraction, is a midnight blue with a purplish hue. Additionally, in 2013, Na'ama Sukenik of the Israel Antiquities Authority verified a 1st-century CE-dated fragment of blue-dyed fabric to have used M. trunculus as the source of its pure blue color.[20]

In the 1980s, Otto Elsner,[21] a chemist from the Shenkar College of Fibers in Israel, discovered that if a solution of the dye was exposed to ultraviolet rays, such as from sunlight, blue instead of purple was consistently produced.[22] In 1988, Rabbi Eliyahu Tavger dyed tekhelet from M. trunculus for the mitzvah (commandment) of tzitzit for the first time in recent history.[23] Based on this work, four years later, the Ptil Tekhelet Organization was founded to educate about the dye production process and to make the dye available for all who desire to use it. The television show The Naked Archaeologist interviews an Israeli scientist who also makes the claim that this mollusk is the correct animal. A demonstration of the production of the blue dye using sunlight to produce the blue color is shown. The dye is extracted from the hypobranchial gland of Hexaplex (Murex) trunculus snails.[14]


In conclusion, its colour varies between central sky blue in sunlight, and the iris indigo of the rainbow; translated in a German translation of the biblical book of Exodus, as "blauem purpur".

Alternative interpretations[edit]

Tekhelet is Hebrew for blue, used in Modern Hebrew with meaning of light blue. Karaite Jews believe that the importance of tekhelet is that the color of thread is blue, and not necessarily that it must be a specific dye. Additionally, it is also believed by the Karaites that the Rabbinic tradition that the dye comes from a mollusc is incorrect because such an un-kosher (or "treif") source would be prohibited by the Torah, proposing instead that the source of the dye was indigo or woad (the "Asp of Jerusalem" plant Isatis tinctoria, used as a fast dye in Ancient Egypt).[24][25]

See also[edit]


  • Hoffmann, Roald; Leibowitz, Shira (1997). Old wine, new flasks : reflections on science and Jewish tradition. New York: W.H. Freeman. ISBN 978-0716728993. 
  • Sterman, Baruch; Taubes, Judy (2012). The rarest blue : the remarkable story of an ancient color lost to history and rediscovered. Guilford, Conn.: Globe Pequot Press. ISBN 978-0762782222. 


  1. ^ Compilation; adapted by Rabbi Chaim Miller (2006). Chumash : the five books of Moses : with Rashi's commentary Targum Onkelos and Haftaros with a commentary anthologized from classic Rabbinic texts and the works of the Lubavitcher Rebge (Synagogue ed.). New York, N.Y.: Kol Menachem. p. 967. ISBN 9781934152010. 
  2. ^ a b "Techelet (Blue Thread)". Tzitzit and Tallis. Chabad Media Center. Retrieved 9 April 2013. 
  3. ^ a b c Zohar, Gil. 50561 "Fringe Benefits – Kfar Adumim factory revives the lost commandment of tekhelet" Check |url= scheme (help). www.ou.org. Retrieved 14 March 2013. 
  4. ^ a b Amir, Nina. "Lost thread of blue, tekhelet color reestablished". Religion & Spirituality. Clarity Digital Group LLC d/b/a Examiner.com. 
  5. ^ Rashi, Tosafos, Rosh
  6. ^ Raavad
  7. ^ Rambam
  8. ^ Tekeleth – Strong's Hebrew# 8504
  9. ^ Gesenius Hebrew lexicon entry for "Isles of Elisha" – more modern source needed
  10. ^ On History, Mesorah and Nignaz http://www.divreinavon.com/pdf/HistoryMesorahNignaz.pdf
  11. ^ Simmons, Rabbi Shraga. Tallit stripes
  12. ^ The International Standard Bible Encyclopedia – Page 1057 Geoffrey W. Bromiley – 2007 "The most highly prized dye in the ancient world obtained from the secretions of four molluscs native to the eastern Mediterranean: helix ianthina, murex brandaris, murex trunculus, and purpura lapillus. Various shades could be produced"
  13. ^ Hoffmann, Roald; Leibowitz, Shira (1997). Old wine, new flasks : reflections on science and Jewish tradition. New York: W.H. Freeman. ISBN 978-0716728993. 
  14. ^ a b Hoffmann, Roald. "Indigo - A Story of Craft, Religion, History, Science and Culture". http://scarc.library.oregonstate.edu. Special Collections & Archives Research Center Oregon State University Libraries - April 19, 2012. Retrieved 16 February 2015. 
  15. ^ Sterman, Baruch; Taubes, Judy (2012). The rarest blue : the remarkable story of an ancient color lost to history and rediscovered. Guilford, Conn.: Globe Pequot Press. ISBN 978-0762782222. 
  16. ^ P'til T'khelet, p.168
  17. ^ Herzog, p.71
  18. ^ The color techelet
  19. ^ Kraft, Dina (2011-02-27). "Rediscovered, Ancient Color is Reclaiming Israeli Interest". New York Times. 
  20. ^ "Why so blue? Biblical dye was made from snails". www.nbcnews.com. Associated Press. Dec 31, 2013. Retrieved December 31, 2013. 
  21. ^ Robin Ngo (11 September 2013). "What Color Was Tekhelet?". Retrieved 20 January 2014. Decades after Herzog’s death, chemist Otto Elsner proved that murex dye could in fact produce a sky-blue color by exposing the snail secretions to ultraviolet rays during the dyeing process. Sky-blue tzitzit, then, could be made with murex dye. 
  22. ^ O. Elsner, "Solution of the enigmas of dyeing with Tyrian purple and the Biblical tekhelet", Dyes in history and Archaeology 10 (1992) p 14f.
  23. ^ Navon, Mois (December 30, 2013). "Threads of Reason-A Collection of Essays on Tekhelet" (PDF). p. 23. Retrieved 20 January 2014. In 1985, while writing a book about tzitzit entitled Kelil Tekhelet, R. Eliyahu Tavger became convinced that the source of authentic tekhelet had been found. Determined to actualize his newfound knowledge, and after much trial and error, he succeeded in applying the process, according to halakhah, from beginning to end. He thus became the first person, since the loss of the hillazon, to dye tekhelet for the purpose of tzitzit. In 1991, together with R. Tavger, Ptil Tekhelet was formed to produce and distribute tekhelet strings for tzitzit. 
  24. ^ They Shall Make for Themselves Sisith (Fringe/Tassel) by Hakham Meir Yosef Rekhavi
  25. ^ What is the True Tekhelet? by Dr. Curtis D. Ward