| 摘要 |
A waterproof chalk composition including silicone oil (1-15% by weight), powdered chalk, and optional colorants (such as iron oxide, ultramarine, malachite, inks or synthetic pigments), suitable for applying to a chalk line of a chalk line device, is disclosed. The method of manufacturing the waterproof chalk composition may be solvent-free and hence can be used or packaged immediately after preparation, and does not require a drying step to evaporate solvents. Also disclosed is a chalk line device containing a waterproof chalk composition and methods of forming a waterproof chalk composition. |
