石蕊试纸遇到酸就变红。
更广义的范围包括碱土金属。碱是强碱性的，会使红石蕊试纸变蓝色；
More broadly, ammonium hydroxide (see ammonia) and soluble hydroxides of the alkaline earth metals are also called alkalies.
把管内的氢氧化钠残液倒入水中，你就会发现：溶液会使红色石蕊试纸变蓝。
Turn the remnant of sodium hydroxide in the tube into water, and you'll find the solution turns red litmus blue.
不过，一旦寻得正确的“石蕊试纸检验法”，现在控管肺结核服药的成功案例，就可以在其他疾病上照本宣科。
Find the right "litmus test", though, and what is now being done with TB drugs could succeed with any of these as well.
不过，一旦寻得正确的“石蕊试纸检验法”，现在控管肺结核服药的成功案例，就可以在其他疾病上照本宣科。
Find the right "litmus test", though, and what is now being done with TB drugs could succeed with any of these as well.
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