what is litmus paper blue
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Light Blue litmus paper turns red under acidic conditions and red litmus paperturns blue under basic or alkaline conditions, with the color change occurring over the pH range 4.5–8.3 at 25 °C (77 °F). ... Under acidic conditions, the solution is red, and under alkaline conditions, the solution is blue.
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Litmus paper is filter paper which has been treated with a natural water-soluble dye obtained from lichens. ... Blue litmus paper turns red under acidic conditions (pH below 4.5) while red litmus paper turns blue under alkaline conditions (pH above 8.3).
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