96. Dyeing with Purple (Two Methods)

Grind lime with water and let it stand overnight. Having decanted, deposit the wool in the liquid for a day; take it out (and) dry it; having sprinkled the alkanet with some vinegar, put it to boiling and throw the wool in it and it will come out dyed in purple...alkanet boiled with water and natron produces the purple color.
Then dry the wool, and dye it as follows: boil the seaweed with water and when it has been exhausted, throw in the water an imperceptible quantity of copperas, in order to develop the purple, and then plunge the wool into it, and it will be dyed. If there is too much copperas, it becomes darker.

Citation Type  Fabric Dye Recipe
Citation Year 300