The Epson S020666 Ink Cartridge (part number C33S020666) is a specialized cartridge designed for older Epson Stylus Photo inkjet printers that use a six-color ink system.
 
Type: Inkjet Cartridge
Color(s): Light Cyan and Light Magenta (It is a single cartridge that contains two distinct light colors).
Purpose: The light inks (Light Cyan and Light Magenta) are added to the standard four process colors (Black, Cyan, Magenta, Yellow) to create a six-color printing system. This system allows for:
Smoother Tones: Particularly in lighter areas of photographs, reducing the visible dot pattern (graininess).
Enhanced Detail: Providing better color gradation for professional-looking photo prints.