Robin Ngo: What Color Was Tekhelet? 11. September 2013, abgerufen am 20. Januar 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.“
chabad.org
Techelet (Blue Thread). In: Tzitzit and Tallis. Chabad Media Center, abgerufen am 9. April 2013.
divreinavon.com
Mois Navon: Threads of Reason-A Collection of Essays on Tekhelet. 30. Dezember 2013, S. 23, abgerufen am 20. Januar 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 Ḥillazon, 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.“
doi.org
Keith Ramig, Olga Lavinda, David J. Szalda, Irina Mironova, Sasan Karimi, Federica Pozzi, Nilam Shah, Jacopo Samson, Hiroko Ajiki, Lou Massa, Dimitrios Mantzouris, Ioannis Karapanagiotis, Christopher Cooksey: The nature of thermochromic effects in dyeings with indigo, 6-bromoindigo, and 6,6′-dibromoindigo, components of Tyrian purple. In: Dyes and Pigments. 117. Jahrgang, Juni 2015, S.37–48, doi:10.1016/j.dyepig.2015.01.025: „A more blue shade can be obtained if the reduced form of DBI, leuco-DBI, is exposed to sunlight whereupon it is debrominated. Then on oxidation, MBI and indigo are formed.“
