Sulphuric Acid 6 oz.
Nitric Acid 4 "
Water 2 "
Mix and the temperature will rise to 170° F.
Inmerse dry cotton wool (best long fibre), be sure wool is dry, draw
it in long flakes and pull it under acids with a stout glass rod; do
not crowd in too much, take care that each tuft is well wetted with
the acids before putting in a fresh tuft. Carefully cover the vessel
and put it where any slight fumes may escape; leave it for at least
12 hours--20 hours will not spoil it. When ready, lift cotton out
and plunge it [p029] into a large quantity of water, quickly
separating the tufts with glass rods, wash in changes of water,
until no acid is left, then wring the cotton in a coarse towel until
dry as possible and pull it all apart and place in the air to dry.