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The bromine test is a simple way to determine the presence of a double bond in a compound. The characteristic brown color of a bromine solution disappears when the Br2 bond is broken. Compounds with double bonds such as alkenes will add bromine across the bond making the brown color of the solution disappear. Compounds without double bonds such as alkanes will not react with bromine, and the brown color will tint the alkane solution. This is considered a negative bromine test.