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It was butter, yellow and sweet.
那是黄油,黄色的,甜甜的。
Methyl yellow, or C.I. 11020, is a chemical compound which may be used as a pH indicator.
In aqueous solution at low pH, methyl yellow appears red. Between pH 2.9 and 4.0, methyl yellow undergoes a transition, to become yellow above pH 4.0.
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