आई ओ एल फैक्ट्री इंडिकेटर नेम टू सब्सटेंस विच कैन बी यूज्ड इन फैक्ट्री इंडिकेटर
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i not understand your question mate ! .
please try in proper english.
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An Olfactory indicator is an indicator whose smell change depending on whether it is mixed with an acidic or basic solution.
Olfactory indicators can be used in the laboratory to test whether a solution is a base or an acid, a process called olfactory titration.
Ex. Onion , clove oil and vanilla.
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