Soft Soaps. These differ from the hard soaps in having potash in place of soda as their alkaline base. They are all more or less pasty or gelatinous; and they may be made either by the boiling or cold process. Of the soft soaps used in perfumery, that known as fig soap is the only one that is boiled.

601. Fig Soap

601. Fig Soap. The fat stock is chiefly oil - generally olive oil - with the addition of a little tallow to give it the granular appearance called fig.

602. Shaving Cream

602.    Shaving Cream. This is made by melting 20 pounds of lard in a steam bath at a temperature of 212°, and then letting 5 pounds of caustic potassa lye of 36° Baum'e run in very slowly, during constant stirring with a wooden paddle; when the paste becomes thick, 5 pounds more of lye are added in the same manner. After several hours' stirring the paste becomes firm, and is finished. It is then transferred to a mortar and triturated until the soap becomes perfectly even throughout, and assumes a pearly appearance. Attar of almonds is the perfume for almond cream; and attar of rose for rose cream. They are dissolved in a little alcohol, and added during the trituration. The rose cream is colored at the same time with tincture of alkanet.

603. Rypophagon Soap

603.    Rypophagon Soap. This is a mixture of equal parts of pale yellow resin soap and fig soft soap, perfumed with attars of anise and citronella.

604. Essence of Soap or Shaving Cream

604.    Essence of Soap or Shaving Cream. Take 1/4 pound white soft soap {see No. 606 (White Soft Soap is soap made of lard and potash)), 2 fluid drachms liquor of potassa; 1 pint rectified spirit, and perfume at will; put them into a strong bottle of glass or tin, cork it close, set it in warm water for a short time, and occasionally agitate it briskly until solution be complete. After repose, pour off the clean portion from the dregs (if any) into clean bottles for use, and at once closely cork them. If the solution be not sufficiently transparent, a little rectified spirit should be added to it before decantation. A little spirit (fully proof) may be added if it be desired to render it thinner. If much essential oil be used to perfume it, the transparency of the product will be lessened.

605. Soft Olive Oil Soap; Medicinal or Toilet Soft Soap

605.    Soft Olive Oil Soap; Medicinal or Toilet Soft Soap is soap made of olive oil and potash. It is yellowish- white, inodorous, and of the consistence of thick honey. It is the soft soap (sapo mollis) of the British Pharmacopoeia.

606. White Soft Soap is soap made of lard and potash

606.    White Soft Soap is soap made of lard and potash. Only used in cosmetics and as a toilet soap.

607. Fine Shaving Cream

607.    Fine Shaving Cream. Take of clarified lard, 7 pounds (avoirdupois); potash lye (26 per cent, of caustic potash), 33/4 pounds; rectified spirits, 3 ounces; oil of bitter almonds, 2 drachms. Melt the lard in a porcelain vessel, by a salt-water bath; then run in the lye, very slowly, agitating the whole time; when about half the lye is in, the mixture begins to curdle; it will, however, become so firm that it cannot be stirred. It will assume a pearly appearance by triturating in a mortar, and slowly adding the alcohol, holding the oil of almonds in solution. This furnishes a splendid shaving cream.