What do you mean by Olfactory indicators !
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Explanation:
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.
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Those substances whose smell (or odour) changes in acidic or basic solutions are called olfactory indicators.
Onion and vanilla extracts are olfactory indicators.
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