Litmus - A simple kind of indicator. It turns red in acids and blue in alkalis, Acid - A substance that turns litmus red. It has a pH of less than 7, Alkali - A substance that turns litmus blue. It has a pH of more than 7, Indicator - A dye that will change colour in acids and alkalis, Universal Indicator - A mixture of indicators giving a different colour depending on how weak or strong an acid or alkali is,

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