The Color Base of Formlabs is the cartridge filled with a base material. Depending on the color you want to print, you can add different amounts of Formlabs pigment to the base cartridge.
Via the Formlabs Color Mixer you can either choose between the colors prepared by Formlabs, or you can mix your own color. Just select the color, add the right amount of pigment, shake the cartridge and start printing.
This Color Base cartridge contains 800 mL of resin.