Patent ID: 7465018

Claim:
A colour printing system comprising a combination of at least four coloured materials, each of a different colour, wherein at least three of the four colours are selected from: (1) a violet-red, wherein red has a highest peak reflectance percentage, followed by violet as next highest peak reflectance percentage and then orange as third highest peak reflectance percentage; (2) an orange-red, wherein red has a highest peak reflectance percentage, followed by orange as next highest peak reflectance percentage and then violet as third highest peak reflectance percentage; (3) a violet-blue, wherein blue has a highest peak reflectance percentage, followed by violet as next highest peak reflectance percentage and then green as third highest peak reflectance percentage; (4) a green-blue, wherein blue has a highest peak reflectance percentage, followed by green as next highest peak reflectance percentage and then violet as third highest peak reflectance percentage; (5) a green-yellow, wherein yellow has a highest peak reflectance percentage, followed by green as next highest peak reflectance percentage and then orange as third highest peak reflectance percentage; and (6) an orange-yellow, wherein yellow has a highest peak reflectance percentage, followed by orange as next highest peak reflectance percentage and then green as third highest peak reflectance percentage, provided the combination is other than cyan, magenta, a yellow and black.