[Phinneous]

I researched and presented a whole class on techeyles once. Of course you probably know that there is an orthodox, though minority, opinion that the correct crustacean has been found and the blue dyed tzitzis can be seen again.

https://goo.gl/images/oazzn9

And Sunken Civ’s article is the murex snail, I believe. What the modern researchers found is that exposing the blood (or bile) mixture of the snail to sunlight for longer times made it shift from reddish purple to the beautiful blue seen in the link.

[EinNYC]

While visiting Israel, I visited the Ptil Tekhelet factory, which is in Kafir Adumim, on the road to the Dead Sea. They raise the snail called the Murex trunculus, which is the rediscovered source of the blue dye for tsitsis, the ritual fringes on the corners of an Orthodox Jewish man's tallis (prayer shawl).

They also raise sheep as a source of wool for the fringes. Visitors can pet the sheep as well as take a turn turning the loom handle to produce the string. Here is the webpage for the factory, with a fascinating account of the history of the rediscovery of the source of this color:

webpage

[Ezekiel]

Thank you much.

The video montage on this page is really neat:

https://www.tekhelet.com/