Home › To Remove Stains And Spots › To Purify Bone Fat

To Purify Bone Fat

Melt the fat with a small quantity of saltpetre (nitrate needless, the water remaining incorporated in of potassa); then add sufficient sulphuric the paste; soaps of this class are called filled acid to decompose the saltpetre. The mass, soaps. after the scum is removed, becomes a light yel- 539. Το Make Tallow Soap. The low color, and is completely deprived of all French Method. Mclt in a boiler, by a offensive smell and animal impurities.

535. To Keep Tallow from Turning Rancid. Cut 50 pounds tallow into slices, and boil it in about 24 gallons water containing 2 ounces alum and 4 ounces salt; strain the fat from the liquid, and wash it in clean water; put into a clean barrel twice as much water at a blood heat as there is grease, and moderate heat, 500 pounds tallow; stir in, by degrees, 35 to 40 gallons caustic soda lye of 10° to 12° Baumé, and let it boil gently for several hours; then add, gradually, 18 to 20 gallons caustic soda lye of 15° to 18º Baumé, and mix until the whole becomes a homogeneous mass of a grayish color; keep the mixture boiling gently for some hours, adding to THE ART OF SOAP-MAKING. grained tallow; add the rest of the lye and stir it briskly for at least an hour; then let it rest, and before it is cold pour it into a frame or box, and finish according to No. 520. 545. it every hour 3 to 4 gallons caustic soda lye of pounds caustic potash with 17 to 20 gallons 20° Baumé. This will occupy 10 or 12 hours. hot water; put a portion of this lye into a The salting process then follows, and is con- clean barrel; stir in by degrees 25 pounds ducted as described in No. 520. After the separation or graining is finished the paste is allowed to stand for a few hours, and the lye is drawn off through a faucet inserted for the purpose in the side of the boiler, near the bottom. The mass is again boiled for some hours, adding every hour 24 gallons soda lye of 25° Baumé, until the hard scales rise to the surface. (See No. 520.) The fire should then be extinguished, and after an hour the under-lye is to be drawn off. Then boil again Dawson's Patent Composite Soap. Strong potash lye, 75 pounds; taltow, 75 pounds; cocoanut oil, 25 pounds. Boil until the compound is saponified in the usual manner.

To make 30 pounds of the new composition, take 2 gallons boiling soft water in a ketfor 14 to 2 hours with about 25 gallons soda tle, add pound sal soda, 2 ounces borax, 2 lye of 4º Baumé, stirring from time to time. table-spoonfuls spirits of turpentine, and 1 The fire should then be removed, and the pan tea-spoonful linseed oil. Stir this mixture unthis mixture uncovered up; the soap will rise to the top of til the borax and soda are dissolved; then add ; then add the lye, and may be poured into the frames, 15 pounds of the above soap made from lye, from lye, care being taken that no lye gets mixed with tallow, and cocoanut oil; and continue the the soap. This should yield about 850 pounds boiling with stirring for 15 minutes, until the , until the of soap. whole is incorporated and dissolved. Now