Don’t miss the amazing story of how…a Pharaoh, a Roman Soldier, three snails, a molecule, and the sun come together to make a simple blue thread called ….Tekhelet. The Ptil Tekhelet Organization offers marine snorkeling tours at the Dor/Nachsholim beach in search of the 'hillazon' (marine snail) used to produce the ancient tekhelet dye in its local habitat. The tekhelet was used in the manufacture of tzitzit (fringes) in ancient times.