Question

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What do you mean by Olfactory indicators ?​

Answer 1

Those substances whose smell (or odour) changes in acidic or basic solutions are called olfactory indicators.

Onion and vanilla extracts are olfactory indicators.

When a basic solution like sodium hydroxide is added to a cloth strip treated with onions (or onion extract), then the smell of onion vanishes.

And when sodium hydroxide is added to vanilla extract, it destroys the characteristic smell of vanilla.

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Answer 2

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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