Now we are slowly draining this liquid through filter paper in the pavilion and we almost have our precious indigo pigment.

现在在观心亭里，我们用滤纸过滤液体，就要得到我们珍贵的靛蓝染料了！

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I had been expecting it to be greener because indigo is not supposed to turn blue until it comes in contact with oxygen, however, perhaps oxygen was already diffusing into the liquid of the dye bath.

我本来觉得它应该要更绿一点，因为靛蓝在接触氧之前是不会变蓝色的。也许在“染色浴”中的液体已经混进来一些氧了。

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OBJECTIVE: To study the optimal extraction method of indigo naturalis in liquid compound preparation.

前言： 目的：优选青黛复方液体制剂的最佳提取方法。

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