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.