Acid turns blue indicator to ________.

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The main use of litmus is to test whether a solution is acidic or basic.
Blue litmus paper turns red under acidic conditions.
Red litmus paper turns blue under basic or alkaline conditions, with the color change occurring over the $$pH$$ range $$4.5–8.3$$ at $$25 ^oC$$.
The neutral litmus paper is purple.

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