What do you mean by Olfactory indicators ?
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An Olfactory indicator is a substance whose smell varies depending on whether it is mixed with an acidic or basic solution. ... Simply put, olfactory indicators are substances which have a different odour in acid and base solutions. For eg: Vanilla extract has a characteristic pleasant smell, onion and clove oil, etc.
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Indicators whose smell will change either in acidic or basic medium is called olfactory indicators
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