This section is from the "Henley's Twentieth Century Formulas Recipes Processes" encyclopedia, by Norman W. Henley and others.
A Hair Shampoo is usually a tincture of odorless soft soap. It is mostly perfumed with lavender and colored with green aniline. Prepared the same as tr. sapon. virid. (U. S. P.), using an inexpensive soft soap, that is a good foam producer. Directions: Wet the hair well in warm water and rub in a few teaspoonfuls of the following formulas. No. I is considered the best:
Cottonseed oil... .
. . — 24
Malaga olive oil. .
.. 90.5 8
.. 30 26
Warm the mixed oils on a large water bath, then the potash and water in another vessel, heating both to 158° F., and adding the latter hot solution to the hot oil while stirring briskly. Now add and thoroughly mix the alcohol. Stop stirring, keeping the heat at 158° F., until the mass becomes clear and a small quantity dissolves in boiling water without globules of oil separating. If stirred after the alcohol has been mixed the soap will be opaque. Set aside for a few days in a warm place before using to make liquid shampoo.