Medicated soaps are made by adding the drug to either hard soap or curd soap in the desired proportions.
Soft or green soap (potassium oleate), made by acting on olive oil with caustic potash, is also used; its preparation (Linamentum saponis) is known as opodeldoc. Curd soap is also used, and is chiefly a stearate of sodium.
In 1878, at Bristol, the special awards were all for dairy appliances -milk-can for conveying milk long distances, churn for milk, churn for cream, butter-worker for large dairies, butterworker for small dairies, cheese-tub, curd knife, curd mill, cheese-turning apparatus, automatic means of preventing rising of cream, milk-cooler and cooling vat.
But in all countries a mixture of several oils enters into the composition of curd soaps and the proportions used have no fixity.
Coconut soap also forms a principal ingredient in compound soaps meant to imitate curd and yellow soaps.
The contents of the pan are once more allowed to cool and settle, and the soap as now formed constitutes a pure curd coap, carrying with it some proportion of uncombined alkali, but containing the minimum amount of water.
Of Kan-suh are cloth, horse hides, a kind of curd like butter which is known by the Mongols under the name of wuta, musk, plums, onions, dates, sweet melons and medicines.
When about too lb of silk has been bagged, the whole is placed in a large wooden tub and covered with boiling water in which 12 to 20 lb of white curd soap has previously been dissolved.
Being thus soluble in salt water it cannot, of course, be salted out like common soaps; but if a very concentrated salt solution is used precipitation is effected, and a curd soap is separated so hard and refractory as to be practically useless.
A similar cement is a mixture of dried fresh curd with i nth of its weight of quicklime and a little camphor; it is made into a paste with water when employed.