Q. Test for the presence of linseed oil?

Hexabromide test is done to know the extent of presence of linolenic acid. In presence of fish oils, which are rich in linolenic acid, the test gives precipitates where as if other oils like rapeseed oil are present, the test gives a clear solution. Animal fats may give turbidity when tested in this way. Thus, this test is carried out to test the presence of linolenic acids in the samples.