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- It is a chemical test to detect the presence of pentoses.
- The components for this test are orcinol, hydrochloric acid, and ferric chloride.
- This test is based on the principle in which pentoses are dehydrated into furfural which in turn condense with orcinol to give a blue-green precipitate or bluish precipitate.
- The chemical equation is as follows:
Indication of test:
- A positive test for pentoses is indicated by the formation of a bluish precipitate.
- A negative test is indicated by the formation of all other colours.