Shoreshthe drift report · all case files
Case file

Tekhelet

Wikipedia's first sentence called it “highly valued dye described as either “ skyblue ””. Today it says “blue dye that historically held great significance in ancient mediterranean civilizations”. The one-line description Wikipedia serves to search engines and AI systems read “Blue dye mentioned in the Hebrew Bible and prized by ancient Mediterranean civilizations”. It now reads “Blue dye prized by ancient Mediterranean civilizations”.
Measured, not asserted. Every count, date and revision on this page was taken from Wikipedia's own history and checked against the live article. The words quoted are theirs.
Machine-checked against the full current article on 2026-08-03.
We saved snapshots of this article over twenty years; you are reading the 2020 one. Red dashes: removed from Wikipedia since. Pale dots: rewritten; the numbered note shows what it says now. 1 tap a number or a side note to jump between them
The opening as it read in 2020

A blue dye prized by ancient Mediterranean civilizations A set of Tzitzit, four tassels or "fringes" with blue threads produced from a Hexaplex trunculus based dye — tied according to the opinion of the Sefer ha-Chinuch .1 Tekhelet ( ; alternate spellings include tekheleth , t'chelet , techelet and techeiles ) is a "blue-violet", "blue", or "turquoise" dye highly prized by ancient Mediterranean civilizations and mentioned 49 times in the Hebrew Bible / Tanakh .2 It was used in the clothing of the High Priest , the tapestries in the Tabernacle , and the tzitzit (fringes) affixed to the corners of one's four-cornered garments, including the tallit .3 Tekhelet dye was critical for the production of certain articles in the Temple, as well as for the commandment of tzitzit. Tekhelet is most notably mentioned in the third paragraph of the Shema , quoting Numbers 15:37–41 . However, neither the source nor method of production of Tekhelet is specified in the Bible , but according to the Tosefta the Ḥillazon is the exclusive source of the dye. The Talmud further informs us that the dye of Tekhelet was produced from a marine creature known as the Ḥillazon .4 A garment with tzitzit has four tassels, each containing four strings. There are three opinions in Rabbinic literature as to how many of the four strings should be dyed with tekhelet : two strings; one string; or one-half string.5 Knowledge of how to produce tekhelet was lost in medieval times, and since then tzitzit did not include tekhelet . However, in modern times, many Jews believe they have identified the Hillazon and rediscovered tekhelet manufacture process, and now wear tzitzit which include the resulting blue dye. The Five Books of Moses: A New Translation with Introductions, Commentary, and Notes.6 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.).7

This is Wikipedia's own text, saved in our repository. Their copy of it is revision 965514095.
Today
Wikipedia's first sentence called it “highly valued dye described as either “ skyblue ””. Today it says “blue dye that historically held great significance in ancient mediterranean civilizations”. The one-line description Wikipedia serves to search engines and AI systems read “Blue dye mentioned in the Hebrew Bible and prized by ancient Mediterranean civilizations”. It now reads “Blue dye prized by ancient Mediterranean civilizations”. Read the current article and compare.
2005201020152020Oct '232025
Counts in the opening at each snapshot. Green: the word gained ground. Red: it was cut. Grey: no change.

What Wikipedia says this is

Every article opens by defining its subject. This one was redefined since October 7, and today's defining sentence is their current revision.

Then

highly valued dye described as either “ skyblue ”

Now

blue dye that historically held great significance in ancient mediterranean civilizations

Sections that no longer exist

Present on October 6, 2023, absent today, with no near-matching heading in the current article and the article shorter overall, so this is not a renamed heading or a topic absorbed into a fuller treatment. 1 section of 400 characters or more gone since October 6 2023, with the article 4,466 characters shorter.

  • Sources
Struck red text is no longer in the article; dotted amber text was rewritten. Every revision id links to Wikipedia's copy; the text shown is our own saved copy. Data: /data. Wikipedia text is CC BY-SA; quoted for the record; not affiliated with Wikipedia.

← back to the drift report