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What color does litmus paper turn?

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Blue litmus paper turns red when it is exposed to acidic conditions; red litmus paper does the opposite, turning blue when exposed to basic conditions. The color that the litmus paper turns depends on what color it is initially.

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Full Answer

Litmus paper is used as an indicator of pH value. It is tissue paper that is treated with a natural water-soluble dye obtainable from lichens. There is also neutral litmus paper, which is purple. Litmus paper is one of the oldest methods of detecting acidity in a variety of products. It is still very reliable and used for determining general pH levels today.

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