| 1. | Rosin | 8 parts |
|---|---|---|
| Wax | 1 part | |
| Turpentine | 1 part |
It has little or no body, and is used in thin layers.
For nitric and hydrochloric acid vapors:
| 2. | Rosin | 1 part |
|---|---|---|
| Sulphur | 1 part | |
| Fire clay | 2 parts |
Sulphur gives great hardness and permanency to rosin lutes, but this composition is somewhat brittle.
Good waterproof lutes of this class are:
| 3. | Rosin | 1 part |
|---|---|---|
| Wax | 1 part | |
| Powdered stone | 2 parts | |
| 4. | Shellac | 5 parts |
| Wax | 1 part | |
| Turpentine | 1 part | |
| Chalk, etc. | 8 to 10 parts |
For a soft air-tight paste for ground-glass surfaces:
| 5. | Wax | 1 part |
|---|---|---|
| Vaseline | 1 part |
6. A strong cement, without body, for metals (other than copper or alloys of same), porcelain, and glass is made by letting 1 part of finely powdered shellac stand with 10 parts of ammonia water until solution is effected.