A device and method for mixing and applying hair coloring chemicals to a user's hair. The device comprises a brush applicator, a first compartment capable of holding the brush applicator in a locked position, a second compartment containing a first hair coloring chemical, a third compartment containing a second hair coloring chemical, and a membrane. The membrane is located between the second compartment and the third compartment such that the first hair coloring chemical is separated from the second hair coloring chemical by the membrane when the brush applicator is in the locked position. When the brush applicator is released from the locked position, the brush applicator is movable toward the membrane to puncture the membrane. Upon puncture, the membrane retracts to a peripheral edge of the membrane to cause the first hair coloring chemical and the second hair coloring chemical to be mixed together.