The proper PH value is 3-4 for poplar dying in the acid solution.
酸性染料染色时，染液的ph值控制在3 - 4之间，最利于杨木单板色。
Meanwhile, the three kinds of foam cannot barbotage in the acid solution.
在酸性条件下，这三种泡沫都几乎不发泡。
Though it is soluble in the acid solution, it can be degraded and isn't steady.
虽然它能溶于酸溶液中，但会发生降解而不稳定。
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