CHIP SOAP.
Chip soap is used extensively in laundries but is also used largely in other branches. It may be made either as a settled soap or by the cold made process.
To make a full boiled settled chip soap, proceed as directed under settled laundry soap. The kettle is stocked with light grease or a mixture of grease with corn oil or other cheap oils. For this kind of soap the rosin is eliminated.
Chip soap may be filled as well as laundry soap. This is done in the crutcher and the following adulterations are suitable.
| lbs. | |
| Settled Soap | 700 |
| Soda Ash | 35 |
| Sodium Silicate | 215 |
| or | |
| Settled Soap | 700 |
| Silicate of Soda | 560 |
| Soda Ash | 18 |
| Carbonate of Potash, 26° B. | 50 |
The cheapest method of drying is by running this soap through a drying machine and this is the procedure usually carried out for making dried chip soap.
COLD MADE CHIP SOAPS.
To make chip soaps by the cold process a sweet tallow of low percentage of free fatty acid should be employed. The tallow is heated to 120° to 135° F. and the lye run in slowly at first and then the silicate of soda is added. The mass is then mixed until a finger drawn through the soap leaves a slight impression, then dropped into frames or barrels. Soaps containing a small percentage of fat should be well covered in the frame for twenty-four hours to retain their heat and insure proper saponification. The following formulae are suitable: