Researchers have discovered the tools proving that the blue (tchelet) and purple (argaman) dyes were produced in industrial quantities in the Land of Israel in biblical times. They have documented how the material was produced for hundreds of years at Tel Shiqmona on Israel’s Carmel Coast.
https://journals.plos.org/plosone/article/figure?id=10.1371/journal.pone.0321082.g012
https://unitedwithisrael.org/ancient-tools-reveal-economic-power-behind-biblical-israel/