The Color StyleWriter 2400 supports two different ink cartridges depending on the type of printing desired. The High-Performance Ink Cartridge (M3240G/A) is a one-piece assembly that contains the printhead and a black-only ink container. When this cartridge runs out of ink the complete ink cartridge must be replaced.
For color printing Apple sells the Color Ink Cartridge (M3328G/A) which consists of a separate printhead assembly, color ink tank, and black ink tank. The color ink tank contains the cyan, magenta, and yellow inks. The black ink tank contains only black ink. When one of the colors runs out, the empty ink tank can be replaced. The Color Ink Tank is available as M3329G/A, and the Black Ink Tank is available as M3330G/A.