| Several powders or dry colours use a base of asbestos, chalk powder or silica. |
| For most large deposits of agate or silicified wood, silica was derived from the decomposition of volcanic rocks. |
| They used various materials such as lime, copper, silica, iron oxides, and chalk to produce numerous colors. |
| The level of soluble calcium in lime slurry is significantly increased with the addition of silica fume. |
| To preserve fragile and moist blooms such as anemones, daisies, pansies, and zinnias, use silica gel, available from florist and craft suppliers. |
| Consisting of a silica core covered by a metallic shell, the nanoshells capture and focus the passing light, enhancing the Raman effect. |
