If it requires to be red dyed, boil logwood; and in half an hour,
put in the silk, and let it simmer half an hour. Take it out, and
dissolve a little blue vitriol and green copperas, cool the copper,
let it simmer half an hour, then dry it over a stick in the air. If
not red dyed, pin it out, and rinse it in spring water, in which half
a tea-spoonful of oil of vitriol has been put. Work it about five
minutes, rinse it in cold for ten minutes, rinsing in cold water. For
a blue cast, put water, and finish it by pinning and rubbing it with
gum water.