| 1 | We found that this is the best alternative to pumicing . | |
| 2 | With practice, this is also a good alternative to pumicing but takes much longer. | |
| 3 | Ultrafine zircon powder with high purity is a kind of brightening agent in glaze for making high-grade cleaning whiteware . | |
| 4 | And we put them in the can with a little bit of liquid and little bit of grit powder, and we closed the can up and he turned this motor on and he said, "come back tomorrow." | |
| 5 | Because of abundant lime stone resource in our city, the author has researched into preparation and application technology of concrete with milled limestone powder. |
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