95. The Preparation of Purple

Break into small pieces Stone of Phrygia; put it to boiling, and having immersed the wool, leave it until it cools. Then throwing in the vessel a mina of seaweed, put it to boiling and throw in it (again) a mina of seaweed. Let it boil and throw the wool into it, and letting cool, wash in sea water...[the stone of Phrygia is roasted before being broken]...until the purple coloration appears.

Citation Type  Fabric Dye Recipe
Citation Year 300