2. Lime forming the well-known putty.
Linseed oil forming the well-known putty.
3. Red or white lead and linseed oil.
These mixtures become very strong when set and are best diluted with powdered glass, clay, or graphite. There are almost an endless number of lutes using metallic oxides and linseed oil. A very good one, not getting as hard as those containing lead, is:
4. Oxide of iron and linseed oil.
IX. Casein, Albumen, and Glue.—These, if properly made, become very tough and tenacious; they stand moderate heat and oil vapors, but not acid vapors.
| 1. | Finely powdered casein | 12 parts |
|---|---|---|
| Slaked lime (fresh) | 50 parts | |
| Fine sand | 50 parts | |
| Water to thick mush. |
A very strong cement which stands moderate heat is the following:
| 2. | Casein in very fine powder | 1 part |
|---|---|---|
| Rubbed up with silicate of soda | 3 parts |
A strong lute for general purposes, {35} which must be used promptly when made: