Blue dyed wool, was one of the materials that the children of Israel used for building the Tabernacle.

How was the color blue produced?

The blue color was produced from the Slug!

According to the Babylonian Talmud, Snail - this animal with a shell, it is in the Mediterranean, but you can not notice it in the water.

The color should be produced from the Slug, alive.

The blue would be manufactured on the northern coast of Israel, a plot of the tribe of Zebulun.

In addition to the Tzitzit strings, blue was used for making garments of the priests and the curtain in the Temple. Blue was the color is well known and respected and noble, not only Jews but also to Egypt, Greeks.

We all look forward for Moshiach to tell us what species of snails produce the color blue that was used during the Temple era. When that happens, we all (boys) can wear blue Tzitzis no doubt.