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litmus paper

1 ENTRIES FOUND:
litmus paper /ˈlɪtməs-/ noun
litmus paper
/ˈlɪtməs-/
noun
Britannica Dictionary definition of LITMUS PAPER
[noncount] technical
: special paper that is used to test how much acid is in a solution
◊ Litmus paper turns red in acid solutions and blue in alkaline solutions.