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, a second compartment containing a first hair coloring chemical, a third compartment containing a second hair coloring chemical, and a membrane. The brush applicator is movable toward the membrane to puncture the membrane and cause the hair coloring chemicals to be mixed together. In another embodiment, the device contains two or more hair coloring chemicals, at least one in at least one receptacle within the device. The device further comprises a cutting member in the form of a cursor, pull-member, rotatable element, or push-member to cut open the receptacle(s) within the device to release and thereby mix the hair coloring chemicals. The device can include an applicator removably attached to the housing to apply the mixed hair coloring chemicals.