The political litmus test is often used when appointing judges. There is no litmus test based on religion. I do not pass his litmus test on social policy. The main use of litmus is to test whether a solution is acidic or basic. Reality is not a quality you can test with litmus paper. The oxides exhibit basic character&colon; they turn phenolphthalein red and litmus, blue. They exhibit basic character&colon; they turn phenolphthalein pink and litmus, blue. Litmus paper may be used to test for chemical causes. The event was seen as a litmus test for Li. This was seen as a litmus test for the #changethedate movement. Aqueous solutions of phenol are weakly acidic and turn blue litmus slightly to red. For instance, ammonia gas, which is alkaline, turns red litmus paper blue. Brown, pungent effervescence is observed which turns blue litmus red. Santonin is neutral to litmus paper moistened with alcohol. Acid-base indicators on litmus owe their properties to a 7-hydroxyphenoxazone chromophore.