229.Dyeing purple

Put defrothed urine in a cooking pot, and place at the fire. Wrap some vermiculum that has been ground in a mortar in a linen cloth of loose mesh, put it into the pot as it is heating, and agitate it until whatever can come out of the cloth does come out. Put the residue that remains back into the mortar and grind it, wrap it in the cloth, put it into the pot while

Citation Type  Fabric Dye Recipe
Citation Year 800