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A device mixing ingredients for coloring hair includes a mixing bowl and a housing removably placed atop the mixing bowl so that a pair of agitators rotatably and coaxially mounted within the housing extend downward into the mixing bowl, being driven in opposite directions at the same speed by a mec

A device mixing ingredients for coloring hair includes a mixing bowl and a housing removably placed atop the mixing bowl so that a pair of agitators rotatably and coaxially mounted within the housing extend downward into the mixing bowl, being driven in opposite directions at the same speed by a mechanism powered by a hand crank, which can be turned in either direction to cause one of the agitators to move a liquid inward within the mixing bowl while the other agitator moves the liquid outward. In an alternative version of the device, the agitators are driven by an electric motor.

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1. Mixing apparatus comprising: a mixing bowl having an open top and a and a central lower portion having a flat inner surface;a housing, removably attached to extend over the open top of the mixing bowl,a pair of agitators, comprising an upper agitator including a tube rotatably attached to the hou

1. Mixing apparatus comprising: a mixing bowl having an open top and a and a central lower portion having a flat inner surface;a housing, removably attached to extend over the open top of the mixing bowl,a pair of agitators, comprising an upper agitator including a tube rotatably attached to the housing, a lower agitator including a shaft extending upward within and beyond the tube, attached to rotate within the tube, wherein each of the agitators additionally includes a central hub pair of arms extending outward from opposite sides of the hub, with each of the arms including spaced-apart upward and downward facing flat surfaces extending between a pair of spirally curved mixing surfaces extending outward from the hub, including first and second mixing surfaces, each spirally curved in a common direction while extending outward from the central hub, anda drive, operatively connected to each of the agitators, causing the agitators to rotate at a common speed in opposite directions. 2. The mixing apparatus of claim 1, wherein the drive comprises: a first miter gear, rigidly attached to the tube of the upper agitator;a second miter gear, rigidly attached to the shaft of the lower agitator, anda third miter gear, rotatably attached to the housing, engaging both the first miter gear and the second miter gear, causing the first and second miter gears to rotate in opposite directions. 3. The mixing apparatus of claim 2, wherein the drive additionally comprises a crank causing rotation of the first miter gear. 4. The mixing apparatus of claim 3, wherein the drive additionally comprises a drive shaft connected to the crank and to the first miter gear through a meshed pair of gears to drive the first miter gear with rotation of the crank. 5. The mixing apparatus of claim 4, wherein the crank includes an arm and a knob at an end of the arm,the arm is attached to the drive shaft to pivot between an open position, in which the knob extends upward from the arm, and a closed position, in which the knob extends downward from the arm, andthe housing includes an upper cover having a cavity for accepting the knob as the arm is moved into the closed position. 6. The mixing apparatus of claim 1, wherein the arms of the lower agitator are spaced apart from, but moved in proximity to, the flat central portion of the mixing bowl, andthe arms of the upper agitator are spaced apart from, and moved in proximity to, the arms of the lower agitator. 7. The mixing apparatus of claim 1, wherein all of the arms are identical. 8. Mixing apparatus comprising: a mixing bowl with a round open top and a central lower portion having a flat inner surface;a housing including a lower cover, a ring extending downward from the lower cover within the round open top of the mixing bowl to hold the housing in place atop the mixing bowl, an upper cover including a truncated spherical surface extending outward beyond the mixing bowl to facilitate moving the housing upward, off the mixing bowl, with finger tips, and a handle, extending outward and downward to facilitate holding the housing,a crank, extending outward above the housing, attached to the housing to rotate about a crank axis of rotation;a pair of agitators, each attached to the housing to rotate about a common axis of rotation and to extend downward within the mixing bowl, wherein each of the agitators comprises a centrally disposed hub and a air of arms extending outward from opposite sides of the hub, wherein all arms within the agitators are identical, with each of the arms including spaced-apart upward and downward facing flat surfaces extending between a pair of spirally curved mixing surfaces extending outward from the hub, being spirally curved in a common direction, and wherein each of the upward and downward facing flat surfaces is parallel to the flat inner surface of the mixing bowl; anda drive, operatively connected to each of the agitators, causing the agitators to rotate at a common speed in opposite directions as the crank is rotated. 9. The mixing apparatus of claim 8, wherein each of the agitators includes at least one first mixing surface moving a liquid within the bowl outward when the agitator is rotated in a first direction and at least one second mixing surface moving a liquid within the bowl inward when the agitator is rotated opposite the first direction, and wherein the mixing surfaces of the actuators are disposed adjacent one another, being spaced apart along the common axis of rotation. 10. The mixing apparatus of claim 9, wherein each of the agitators includes a hub disposed at the common axis of rotation,the first and second mixing surfaces of each of the agitators spiral outward along at least one arm from the hub of the agitator; andthe pair of agitators comprises an upper agitator including a tube rotatably attached to the housing and extending downward to the hub of the upper actuator, and a lower agitator including a shaft extending through the tube, to the hub of the lower actuator, and rotating within the tube. 11. The mixing apparatus of claim 8, wherein the housing additionally includes a housing handle, extending outward and downward to a housing handle tip,the mixing bowl additionally includes a bowl handle, extending outward and upward to a bowl handle tip, andthe housing can be rotated atop the mixing bowl to align the housing handle tip with the mixing bowl handle tip. 12. The mixing apparatus of claim 8, wherein the mixing bowl includes an upper surface having a plurality of slots for holding brushes used to apply a mixture formed within the bowl. 13. The mixing apparatus of claim 8, wherein the arms of the lower agitator are spaced apart from, but moved in proximity to, the flat central portion of the mixing bowl, andthe arms of the upper agitator are spaced apart from, and moved in proximity to, the arms of the lower agitator. 14. The mixing apparatus of claim 8, wherein all of the arms are identical.