1510. To Bleach Cotton Seed Oil

1510.    To Bleach Cotton Seed Oil. Use 1 gallon English caustic soda, in a solution of about 40° Baum'e, to about 20 gallons crude oil. The oil, previous to being mixed with the solution, must be heated to about 90° Fahr. Stir constantly while adding the cold solution. If the oil is not now sufficiently light, add more of the solution to bring it to a light yellow or straw color.

1511. Keyer's Process for Purifying Oils

1511.    Keyer's Process for Purifying Oils. The process of M. Keyer, which is applicable to all oils, has given excellent results in a manufactory of rape seed oil. Into 1000 parts by weight of oil, put a mixture of 6 parts solution of ammonia and 6 parts water, and agitate the barrel well until the alkali is perfectly mixed, which may be done in 15 minutes. The barrel is then sealed hermetically, and, after 3 days' repose, the oil is decanted and filtered. The residue is used for the manufacture of soap. Oil thus worked contains no trace of acid, and the mucilaginous impurities are destroyed or precipitated.

1512. Liebig's Method of Obtaining Non-poisonous Oil of Almonds

1512. Liebig's Method of Obtaining Non-poisonous Oil of Almonds. Agitate the crude distilled oil with binoxide of mercury in slight excess; and, after a few days' contact, rectify the oil from a little fresh bin-oxide of mercury. The product is quite pure, if properly managed, as the hydrocyanic acid (the poisonous principle) of the oil, unites with the binoxide to form a bicyanide of mercury.

1513. Neat's-foot or Trotter Oil

1513. Neat's-foot or Trotter Oil. Obtained by boiling neat's-foot, tripe, etc., in water. It is a coarse animal oil, very emollient, and much used to soften leather.

1514. To Refine Neat's-foot Oil

1514.    To Refine Neat's-foot Oil. Put a quart of the oil with 1/2 pound bright lead shavings, and 1/2 pound quicklime pounded, into a glass bottle, let it stand in the sun and light for 2 or 3 weeks, then put the oil and lime into a saucepan with £ pound washing soda, boil gently 15 minutes, then set in the coldest place possible till the next day, when it will be found congealed; place it into a filter of white blotting paper, place a clean glass bottle under the filter, and you will get the finest oil, suitable for the most delicate machinery. Any one requiring a little nice oil would do well to try this in preference to buying it ready done. It must be kept perfectly cold while filtering, or the soda will go through.

1515. Hirzel's Method of Preserving Animal Fats

1515.    Hirzel's Method of Preserving Animal Fats. Mix 14 pounds of recently melted fat with 5 drachms salt and 15 grains alum in fine powder; heat until a scum is formed on the surface; remove the scum, and when the clear fat is cool, wash and knead it in water, frequently changing the water, so as to remove all the salt; then evaporate the water at a heat insufficient to injure the fat.