[Avodah] tekhelet is midnight blue

[Ilana Elzufon]

Not clear to me what the chidush is in this article. The item they found is
not tzitzit. We already know that trunculus murex was used to produce dye,
based on archaeological evidence of dye factories with murex shells.

By the way, if you look up at the top of the sky, even at midday on a sunny
day, it is a relatively dark blue and not dissimilar to the colour of ptil
tekhelet tizitzit. Pale "sky blue" is more what you see looking straight
ahead, at the sky near the horizon.

- Ilana
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