It doesn’t fade over time. The dye bonds chemically with the fabric, making it nearly impossible to remove, even with bleach.

"[Purple dye] is made from a gland found in the marine mollusk Hexaplex trunculus,” explained study author Golan Shalvi in an ...

Tel Shiqmona during the Iron Age: A first glimpse into an ancient Mediterranean purple dye ‘factory’ Tel Shiqmona during the Iron Age: A first glimpse into an ancient Mediterranean purple dye ...