另一个例子是甲基橙，它在酸性溶液中为红色而在碱性溶液中为黄色。
Another example is methyl orange, which is red in acids and yellow in alkali solutions.
该产品应用于染料废水的处理，考察了其对不同浓度的达旦黄、食品黄、甲基橙和活性红色度的去除效果。
The product, PAC, was applied to the treatment of dyeing wastewater. The effect of PAC on removing Yellow Clayton, Methyl Orange, Food Yellow and Reactive Red was investigated.
另一个例子是甲基橙，它在酸性溶液中为红色而在碱性溶液中为黄色。
Another example is, which is red in acids and yellow in alkali solutions.
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