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FLEXO Magazine : April 2011
Technologies & Techniques Color CI Name CI# Alt. Name Solvent UV WB Red Red 2 C.I . 12310 Naphthol AS x x,x x,x Red Red 81:1 C.I . 12487 Naphthol Rubine FGB Red Red 22 C.I . 12315 Brilliant Red RN x x Red Red 48:1 C.I . 15865:1 Permanent Red 2BN x x x,x Red Red 48:3 C.I . 15865:3 Pigment Red 2BS x x Red Red 53:1 C.I . 15585:1 Lake Red C x x Red Red 57 C.I . 15850:1 Lithol Rubine BK x x,x x,x Red Red 184 C.I . 12487 Pigment Rubine F6B x x x Red Red 266 C.I . 12474 Pigment Red P-F2RK x x x Orange Orange 5 C.I . 12075 Permanent Orange RN x x x,x Orange Orange 13 C.I . 21110 Permanent Orange G x,x Orange Orange 16 C.I . 21160 Benzidine Orange R x x,x Orange Orange 34 C.I . 21115 Permanent Orange RLO x x x,x Orange Orange 64 C.I . 12760 Orange GP x Green Green 7 C.I . 74260 Fast Green G x x,x x,x Green Green 36 C.I . 74265 Phthalocyanine Green G Blue Blue 29 C.I . 77007 Ultramarine Blue Blue Blue 61 C.I . 42765:1 Pigment Blue AR x x x Blue Blue 62 C.I . 42595:4 Brilliant Blue CF Violet Violet 1 C.I . 45170:2 Fast Rose Toner Violet Violet 3 C.I . 42535:2 Fast Violet Toner x x,x Violet Violet 23 C.I . 51319 Fast Violet RL x x,x x,x Violet Violet 27 C.I . 77510 Violet Toner 27 x Violet Violet 37 C.I . 51345 Dioxazine Violet with a standard four-color process setup, CMYK truly limits the range of possible colors perceptible in the visible spectrum. By adding red, orange, green, blue or violet hues it is possible to extend the color gamut beyond the four standard process colors. Notice the RGB color space shown in Figure 1. The RGB color space is expanded at the red, green and blue hue angles, broadening options beyond cyan, magenta, yellow and black. Similar to choosing a red, green or blue angle, an orange or violet angle are other plausible options that may enlarge the color space. The significant consideration for ink selection is therefore the hue angle. The hue is the defining element of a chosen color; it differentiates between a red shade of yellow and a cyan shade of green. It describes how much red, green, blue or yellow is in a specific color. Several colors may have the same hue angle but vary in chroma or lightness, therefore yielding a different color entirely. Although hue is significant, it is not the only quality of a pigment to examine. A second characteristic to consider is the chroma. Selecting pigments with the highest chroma will Table 1: ink bases initially selected for developing standardized ink sets for expanded gamut printing. A white ‘x’ denotes an ink base available through environmental inks and Coatings, where a black ‘x’ denotes an ink base available through The Flint group, the two primary donors that made this research possible. Figure 2c: spectral reflectance curves for Red 2. Figure 2d: spectral reflectance curves for orange 5. 48 FLeXO ApRil 2011 www.flexography.org