Minerals in unglazed white magnetic board across the traces left behind. The color can be used to identify minerals
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No. 3
Minerals in the unglazed white porcelain plate on a clean program traces left by the powder. Streak color can be eliminated or reduced due to impurity or physical optics because the color of minerals caused by the distortion of the relative mineral block color is more fixed, commonly used in the identification of minerals. 【】 Mineral streak in unglazed white porcelain plate on a clean program traces left by the powder. Streak color can be eliminated or reduced due to impurity or physical optics because the color of minerals caused by the distortion of the relative mineral block color is more fixed, commonly used in the identification of minerals.