What is "hexachrome"

Hexachrome was a six-color printing process designed by Pantone Inc. In addition to custom CMYK inks, Hexachrome added orange and green inks to expand the color gamut, for better color reproduction. It was therefore also known as a CMYKOG process. Hexachrome was discontinued by Pantone in 2008 when Adobe Systems stopped supporting their HexWare plugin software. While the details of Hexachrome were not secret, use of Hexachrome was limited by trademark and patent to those obtaining a license from Pantone. The inventor of Hexachrome was Richard Herbert, who is also the president of Pantone Inc.