litmus - Hutchinson encyclopedia article about litmus Printer Friendly
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litmus

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litmus

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The pH levels of some common substances. The lower the pH, the more acidic the substance; the higher the pH, the more alkaline the substance.

Dye obtained from various lichens and used in chemistry as an indicator to test the acidic or alkaline nature of aqueous solutions; it turns red in the presence of acid, and blue in the presence of alkali.
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He dropped a piece of litmus paper into an acid, when it changed instantly to red, and on floating it in an alkali it turned as quickly to blue.
Moon-Face and Other Stories by London, Jack View in context
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