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.
另一半不做任何处理作为对照，再把这些金黄色的棋盘浸入含蛋白质的溶液中，并允许溶液中的蛋白质与棋盘上的固定蛋白质结合，最后把该棋盘全部浸入加热的铁盐溶液中。
They then dipped the gold into a solution containing the protein, allowing it to bind to the treated squares, and dunked the whole lot into a heated solution of iron salts.
用70%丙酮溶液洗涤滤饼三次后，用清水洗涤一到两次，得到淡黄色固体。
Wash the cake three times with 70% acetone, one or two times with clean water, faint yellow solid is obtained.
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