鉴别珍珠的方法之一，用刀刮一下，如掉粉末，且用手抹被刮处能恢复亮泽，是真珍珠。能恢复亮泽是什么原因？知乎 Sketch Coloring Page

鉴别珍珠的方法之一，用刀刮一下，如掉粉末，且用手抹被刮处能恢复亮泽，是真珍珠。能恢复亮泽是什么原因？知乎 Template

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tomski鉴别珍珠的方法之一，用刀刮一下，如掉粉末，且用手抹被刮处能恢复亮泽，是真珍珠。能恢复亮泽是什么原因？知乎 coloring

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