A mixer is provided for mixing a substance in a container. The mixer includes a motor; a frame configured to be controlled by the motor to rotate on an axis; a carrier disposed at a first end of the frame and configured to hold the container; a counterweight disposed at a second end of the frame opposite to the carrier, wherein the counterweight position relative to the axis is adjustable. The mixer may be a stand-alone unit, or it may be disposed in an apparatus for dispensing a cosmetic composition.

An apparatus, system, and method to maintain a suspended state of particles in an ink, liquid, or paste. The system includes one or more cartridge caddies to hold cartridges containing the particles in the ink, liquid, or pastes therein, and a drive roller and support roller configuration operable to rotatingly support the one or more cartridge caddies at predetermined speeds. Each caddy includes a shaft and at least two plates disposed on the shaft, each plate including one or more corresponding sockets configured to hold the cartridge therebetween.

A mixer is provided for mixing a substance in a container. The mixer includes a motor; a frame configured to be controlled by the motor to rotate on an axis; a carrier disposed at a first end of the frame and configured to hold the container; a counterweight disposed at a second end of the frame opposite to the carrier, wherein the counterweight position relative to the axis is adjustable. The mixer may be a stand-alone unit, or it may be disposed in an apparatus for dispensing a cosmetic composition.