This is the Opaltone Homepage

Opaltone® is a patented imaging technology that digitally mixes CMY+RGB process inks. Black (K) ink is optional. The design & cost benefits are obvious. More colors from less ink. The same inks are always used (just like your color copier). The environmental benefits are also obvious. There is no waste. Opaltone users are already helping to reduce the millions of spot color inks stockpiled across our planet. You can do the same. An expanded gamut and a greener planet. Welcome to the future of print.