By executing show colornames, all the 112 predefined colors will be displayed:

gnuplot> show colornames

There are 112 predefined color names:

white #ffffff = 255 255 255

black #000000 = 0 0 0

dark-grey #a0a0a0 = 160 160 160

red #ff0000 = 255 0 0

web-green #00c000 = 0 192 0

web-blue #0080ff = 0 128 255

dark-magenta #c000ff = 192 0 255

dark-cyan #00eeee = 0 238 238

dark-orange #c04000 = 192 64 0

dark-yellow #c8c800 = 200 200 0

royalblue #4169e1 = 65 105 225

goldenrod #ffc020 = 255 192 32

dark-spring-green #008040 = 0 128 64

purple #c080ff = 192 128 255

steelblue #306080 = 48 96 128

dark-red #8b0000 = 139 0 0

dark-chartreuse #408000 = 64 128 0

orchid #ff80ff = 255 128 255

aquamarine #7fffd4 = 127 255 212

brown #a52a2a = 165 42 42

yellow #ffff00 = 255 255 0

turquoise #40e0d0 = 64 224 208

grey0 #000000 = 0 0 0

grey10 #1a1a1a = 26 26 26

grey20 #333333 = 51 51 51

grey30 #4d4d4d = 77 77 77

grey40 #666666 = 102 102 102

grey50 #7f7f7f = 127 127 127

grey60 #999999 = 153 153 153

grey70 #b3b3b3 = 179 179 179

grey #c0c0c0 = 192 192 192

grey80 #cccccc = 204 204 204

grey90 #e5e5e5 = 229 229 229

grey100 #ffffff = 255 255 255

light-red #f03232 = 240 50 50

light-green #90ee90 = 144 238 144

light-blue #add8e6 = 173 216 230

light-magenta #f055f0 = 240 85 240

light-cyan #e0ffff = 224 255 255

light-goldenrod #eedd82 = 238 221 130

light-pink #ffb6c1 = 255 182 193

light-turquoise #afeeee = 175 238 238

gold #ffd700 = 255 215 0

green #00ff00 = 0 255 0

dark-green #006400 = 0 100 0

spring-green #00ff7f = 0 255 127

forest-green #228b22 = 34 139 34

sea-green #2e8b57 = 46 139 87

blue #0000ff = 0 0 255

dark-blue #00008b = 0 0 139

midnight-blue #191970 = 25 25 112

navy #000080 = 0 0 128

medium-blue #0000cd = 0 0 205

skyblue #87ceeb = 135 206 235

cyan #00ffff = 0 255 255

magenta #ff00ff = 255 0 255

dark-turquoise #00ced1 = 0 206 209

dark-pink #ff1493 = 255 20 147

coral #ff7f50 = 255 127 80

light-coral #f08080 = 240 128 128

orange-red #ff4500 = 255 69 0

salmon #fa8072 = 250 128 114

dark-salmon #e9967a = 233 150 122

khaki #f0e68c = 240 230 140

dark-khaki #bdb76b = 189 183 107

dark-goldenrod #b8860b = 184 134 11

beige #f5f5dc = 245 245 220

olive #a08020 = 160 128 32

orange #ffa500 = 255 165 0

violet #ee82ee = 238 130 238

dark-violet #9400d3 = 148 0 211

plum #dda0dd = 221 160 221

dark-plum #905040 = 144 80 64

dark-olivegreen #556b2f = 85 107 47

orangered4 #801400 = 128 20 0

brown4 #801414 = 128 20 20

sienna4 #804014 = 128 64 20

orchid4 #804080 = 128 64 128

mediumpurple3 #8060c0 = 128 96 192

slateblue1 #8060ff = 128 96 255

yellow4 #808000 = 128 128 0

sienna1 #ff8040 = 255 128 64

tan1 #ffa040 = 255 160 64

sandybrown #ffa060 = 255 160 96

light-salmon #ffa070 = 255 160 112

pink #ffc0c0 = 255 192 192

khaki1 #ffff80 = 255 255 128

lemonchiffon #ffffc0 = 255 255 192

bisque #cdb79e = 205 183 158

honeydew #f0fff0 = 240 255 240

slategrey #a0b6cd = 160 182 205

seagreen #c1ffc1 = 193 255 193

antiquewhite #cdc0b0 = 205 192 176

chartreuse #7cff40 = 124 255 64

greenyellow #a0ff20 = 160 255 32

gray #bebebe = 190 190 190

light-gray #d3d3d3 = 211 211 211

light-grey #d3d3d3 = 211 211 211

dark-gray #a0a0a0 = 160 160 160

slategray #a0b6cd = 160 182 205

gray0 #000000 = 0 0 0

gray10 #1a1a1a = 26 26 26

gray20 #333333 = 51 51 51

gray30 #4d4d4d = 77 77 77

gray40 #666666 = 102 102 102

gray50 #7f7f7f = 127 127 127

gray60 #999999 = 153 153 153

gray70 #b3b3b3 = 179 179 179

gray80 #cccccc = 204 204 204

gray90 #e5e5e5 = 229 229 229

gray100 #ffffff = 255 255 255

Good combinations of colors used for plots are:

• red, green, blue, black, magenta, cyan, sandybrown, dark-violet. This combination is relatively bright and vivid.
• blue, blueviolet, brown, chocolate, dark-green, dark-olivegreen, dodgerblue, saddlebrown. This combination looks a little dark and sober.