I couldn't find a list of color codes, so I created this.
Testing area
editWhite
edit- – Use #FFFFFF
Black
edit- – Use #000000
Gray
edit- – Use #EEEEEE
- – Use #DDDDDD
- – Use #CCCCCC
- – Use #BBBBBB
- – Use #AAAAAA
- – Use #999999
- – Use #888888
- – Use #777777
- – Use #666666
- – Use #555555
- – Use #444444
- – Use #333333
- – Use #222222
Red
edit- – Use #FF3333
- – Use #FF2222
- – Use #FF1111
- – Use #FF0000
- – Use #EE0000
- – Use #DD0000
- – Use #CC0000
- – Use #BB0000
- – Use #AA0000
Pink
edit- – Use #FFEEEE
- – Use #FFDDDD
- – Use #FFCCCC
- – Use #FFBBBB
- – Use #FFAAAA
- – Use #FF9999
- – Use #FF8888
- – Use #FF7777
- – Use #FF6666
- – Use #FF5555
- – Use #FF4444
Magenta
edit- – Use #FF009F
- – Use #FF008F
- – Use #FF007F
- – Use #FF006F
Maroon
edit- – Use #9F0000
- – Use #8F0000
- – Use #7F0000
- – Use #6F0000
- – Use #5F0000
- – Use #4F0000
- – Use #3F0000
- – Use #2F0000
Orange
edit- – Use #FFAA00
Yellow-Orange
edit- – Use #FFDD00
Yellow
edit- – Use #FFFFEE
- – Use #FFFFDD
- – Use #FFFFCC
- – Use #FFFFBB
- – Use #FFFFAA
- – Use #FFFF99
- – Use #FFFF77
- – Use #FFFF66
- – Use #FFFF55
- – Use #FFFF44
- – Use #FFFF33
- – Use #FFFF22
- – Use #FFFF11
- – Use #FFFF00
- – Use #DDDD00
- – Use #CCCC00
- – Use #BBBB00
- – Use #AAAA00
- – Use #999900
- – Use #888800
- – Use #777700
- – Use #666600
- – Use #555500
- – Use #444400
- – Use #333300
- – Use #222200
Gold
edit- – Use #FFD700
Yellow-Green
edit- – Use #DDFFAA
- – Use #DDFF00
- – Use #CCFF00
Green
edit- – Use #EEFFEE
- – Use #DDFFDD
- – Use #CCFFCC
- – Use #BBFFBB
- – Use #AAFFAA
- – Use #99FF99
- – Use #88FF88
- – Use #77FF77
- – Use #66FF66
- – Use #55FF55
- – Use #44FF44
- – Use #33FF33
- – Use #22FF22
- – Use #11FF11
- – Use #00FF00
- – Use #00EE00
- – Use #00DD00
- – Use #00CC00
- – Use #00BB00
- – Use #00AA00
- – Use #009F00
- – Use #008F00
- – Use #007F00
- – Use #006F00
- – Use #005F00
- – Use #004F00
- – Use #003F00
- – Use #002F00
Blue
edit- – Use #CCDDFF
- – Use #EEEEFF
- – Use #DDDDFF
- – Use #CCCCFF
- – Use #BBBBFF
- – Use #AAAAFF
- – Use #9999FF
- – Use #8888FF
- – Use #7777FF
- – Use #6666FF
- – Use #5555FF
- – Use #4444FF
- – Use #3333FF
- – Use #2222FF
- – Use #1111FF
- – Use #0000FF
- – Use #0000DD
- – Use #0000CC
- – Use #0000BB
- – Use #0000AA
Turquoise
edit- – Use #CCEEFF
- – Use #CCFFFF
- – Use #44FFFF
- – Use #33FFFF
- – Use #22FFFF
- – Use #11FFFF
- – Use #00FFFF
- – Use #00DDDD
- – Use #00CCCC
- – Use #00BBBB
- – Use #00AAAA
- – Use #009999
- – Use #008888
- – Use #007777
- – Use #006666
- – Use #005555
- – Use #004444
- – Use #003333
- – Use #002222
Navy
edit- – Use #00009F
- – Use #00008F
- – Use #00007F
- – Use #00006F
- – Use #00005F
- – Use #00004F
- – Use #00003F
- – Use #00002F
Purple
edit- – Use #EEDFFF
- – Use #DDCEF0
- – Use #AA9BCC
- – Use #AA8BCC
- – Use #AA7BCC
- – Use #AA6BCC
- – Use #AA5BCC
- – Use #AA4BCC
- – Use #AA3BCC
- – Use #AA2BCC
- – Use #AA1BCC
Red violet
edit- – Use #FF00FF
- – Use #DD00DD
- – Use #CC00CC
- – Use #BB00BB
- – Use #AA00AA
- – Use #9F009F
- – Use #8F008F
- – Use #7F007F
- – Use #6F006F
- – Use #5F005F
- – Use #4F004F
- – Use #3F003F
- – Use #2F002F
Brown
edit- – Use #DDCEAA
- – Use #CCBD11
Peach
edit- – Use #FFDCBB