Dissolve some indigo in oil of vitriol for twenty-four hours, put a couple of spoonfuls in your pot, add a little crystal of tartar, put in your hackles and boil, or at least keep them at a scalding heat, or the vitriol will burn the feathers, furs, &c., take them out, rinse them well, and the colour will be lasting.

If to the above liquor some fustic chips, well boiled by themselves, and the juice added, you may then have any shade of the best green.