Patent ID: 6843840

Claim:
An ink set comprising at least three color inks: (a) a yellow ink comprising at least one pigment selected from the group consisting of C.I. Pigment Yellow 1, 2, 3, 12, 13, 14, 16, 17, 73, 74, 75, 83, 93, 95, 97, 98, 109, 110, 114, 128, 129, 138, 139, 147, 150, 151, 154, 155, 180, and 185; (b) a magenta ink comprising at least one pigment selected from the group consisting of C.I. Pigment Red 5, 7, 12, 48 (Ca), 57 (Ca), 57:1, 112, 122, 123, 168, 184, 202, and 209, and C.I. Pigment Violet 19; and (c) a cyan ink comprising at least one pigment selected from the group consisting of C.I. Pigment Blue 1, 2, 3, 15:3, 15:4, 15:34, 16, 22, and 60, and C.I. Vat Blue 4 and 60; wherein the, yellow ink has a hue angle H°, as defined in the CIELAB color space on a recording medium, in a range of about 80° to about 110°; the magenta ink has a hue angle H° in a range of about 330° to about 360°; and the cyan ink has a hue angle H° in a range of about 230° to about 260°; the ink set further comprising ink (A) which comprises at least one pigment selected from the group consisting of C.I. Pigment Orange 5, and 62, and C.I. Pigment Red 17, 49:2, 112, 149, 177, 178, 188, 255, and 264, and/or ink (B) which comprises at least one pigment selected from the group consisting of C.I. Pigment Blue 60, and C.I. Pigment Violet 3, 19, 23, 32, 36, and 38, wherein Ink (A) is an ink whose hue angle H° is about 0° to about 80°; and Ink (B) is an ink whose hue angle H° is about 260° to about 330° and wherein the hue angle H° is calculated from H°=tan −1 (b*/a*)+180, where a*<0, or H°=tan −1 (b*/a*)+360, where a*>0 wherein a* and b* express chromaticity indices defined in the CIELAB color space.