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It is a substance used to determine the strengths of acids and alkali.

It changes color according to the pH of the material its in. It is so useful because the color also tells you how strong the substance is. As an example, if you were to put a few drops of the indicator in water it would go green. A few drops of it in cleaning products and it would go a deep purple.
A universal indicator can give various colors to a huge variety of pH ranges.

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13y ago

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