From 1850 to 1911 in the Qing Dynasty, occurrence rate of tongue coating had changed. Those of white, yellow and compound fur were increased. On the contrary, that of black fur was decreased.
清代1850 - 1911年期间苔色的变化特征为：白苔、黄苔的出现率上升，黑苔的出现率下降，复合苔色的描述增加。
From 1850 to 1911 in the Qing Dynasty, occurrence rate of tongue coating had changed. Those of white, yellow and compound fur were increased. On the contrary, that of black fur was decreased.
清代1850 - 1911年期间苔色的变化特征为：白苔、黄苔的出现率上升，黑苔的出现率下降，复合苔色的描述增加。
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