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There are certain substances whose odour (smell)changes in acidic or basic solutions. These substances are called olefactory indicators. The olefactory indicators have a characteristics odour. This odour in olefactory indicators is changed in acidic or basic solution and helps us in detecting whether a given sample solutions is acidic or basic in nature.

An olfactory indicator is a substance whose smell varies depending on whether it is mixed with an acidic or basic solution. These type of indicators are used in laboratories to check whether a given solution is a basic or an acidic solution by a process known as olfactory titration. Onion, clove oil and vanilla extract are some of the examples.

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