To Dye Scarlet
Make a strong infusion of cochineal, put in a few drops of muriate of tin, which will make a crimson, and then put in a little cream of tartar, which will make a clear scarlet. The proportions in weight are one part of muriate of tin to two parts of cream of tartar. It is best to boil the feathers first in the solution of alum. Simmer them until the color is obtained.