| 摘要 |
The method uses a polishing buffer (1) with under abrasive sheets (2) and a second spongy buffer (3) having a mixture (4) consists of oxalic acid in grain (5) of a diameter from four millimetres to eight millimetres and, in the same quantity, to have added other milled oxalic acid (6) having a dimension smaller of the grains (5) but not in dust. To this mixture is added, in quantity like the middle of one of the two components already used, a marble polishing dust (7). All the components are mixing.
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