The dye will turn indigo blue, similar to the color of blue jeans, if exposed to sunlight before the dye sets. One of the dye's main chemical ingredients is red dibromo-indigotin, the main component of tyrian purple or tekhelet. Ancient Mediterranean cultures, including the Minoans, Canaanites/Phoenicians, Hebrews, and classical Greeks created dyes from the snails. This sea snail is historically important because its hypobranchial gland secretes a mucus used to create a distinctive purple-blue indigo dye.
Fossilized shells have been found in Morocco, Italy, and Spain. Murex snails and shells have been probably used in jewels. The snail appears in fossil records dating between the Pliocene and Quaternary periods (between 3.6 and 0.012 million years ago). Shellfish purple, also known as Tyrian purple and royal purple, has a long history. What is peculiar about this specific species is that they show no preference for the size of their prey, regardless of their hunger levels. This species is a group of opportunist predatory snails that are known to attack their prey in groups. It is included in the subgenus Trunculariopsis. Hexaplex trunculus (previously known as Murex trunculus, Phyllonotus trunculus, or the banded dye-murex) is a medium-sized sea snail, a marine gastropod mollusk in the family Muricidae, the murex shells or rock snails.
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