To Dye Cotton or Woollen Black

To each pound of yarn, have one ounce of copperas, nine of logwood, a handful of salt, and a quart of good vinegar, which boil with copperas ten minutes in a brass kettle; shave the logwood, and boil it in an iron pot; when the color is extracted, strain it into the vinegar; put in the yarn, and let it simmer twenty minutes stirring it; then hang it in the air, and if it is not black enough, boil it over. You should have a clear day to do all coloring in.