Air eraser Miniature sand-blasting hand appliance, using compressed air and pumice for removing superfluous lithographic images from the plate.

擦版气笔手提的小型喷砂器，用压缩空气和浮石粉去除平版上多余的印纹。

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Common aggregate used includes sand, gravel, turface, and pumice.

常见的集料包括沙子，碎石，蒙脱石和轻石。

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Aggregate use and considerable resources under the circumstances, the use of fly ash, slag, sand, stone, ceramic, pumice, perlite, etc. (or not added).

集料根据用途及相当资源情况，可选用粉煤灰、矿渣粉、沙子、石粉、陶粒、浮石、膨胀珍珠岩等(也可不加)。

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