reference = {
                # basic
             "white" : [100.00,   0.01,   -0.01], "gray"  : [53.59,   0.00,  -0.01], "black" : [    0,      0,     0],
             "red"   : [ 53.23,  80.11,   67.22], "yellow": [97.14, -21.56,  94.48], "green" : [87.74, -86.18, 83.18],
             "blue"  : [ 32.30,  79.20, -107.86], "violet": [48.85,  88.31, -79.95], "orange": [74.93,  23.94, 78.96],
             "brown" : [ 40.44,  27.50,   50.15], "pink"  : [86.83,  20.60,  -1.54], "gold"  : [86.93,  -1.92, 87.14],
             "silver": [ 77.70,   0.00,   -0.01],

                # extended
            "aquamarine" : [92.04, -45.52,   9.71], "amaranth" : [50.65,  69.83,  26.44],
            "beige"      : [95.95,  -4.19,  12.04], "cyan"     : [91.12, -48.08, -14.14],
            "fuchsia"    : [60.32,  98.25, -60.84], "navy"     : [12.98,  47.51, -64.70],
            "indigo"     : [20.47,  51.69, -53.32], "chestnut" : [39.42,  32.33,  25.52],
            "lime"       : [87.74, -86.18,  83.18], "lime"     : [87.74, -86.18,  83.18],
            "magenta"    : [60.32,  98.25, -60.84], "teal"     : [48.26, -28.84,  -8.48],
            "olive"      : [51.87, -12.93,  56.68], "purple"   : [30.33,  62.04, -63.42],
            "celadon"    : [84.85, -26.62,  19.05]
               }