Hex values will be translated to the closest of the below valid colors for Excel:
Aqua - #33CCCC - rgb(51,204,204)
Automatic - #FFFFFF - rgb(255,255,255)
Black - #100 - rgb(1,0,0)
Blue - #00FF - rgb(0,0,255)
Blue Grey - #6666CC - rgb(102,102,204)
Bright Green - #0FF0 - rgb(0,255,0)
Brown - #99330 - rgb(153,51,0)
Coral - #FF8080 - rgb(255,128,128)
Dark Blue - #0080 - rgb(0,0,128)
Dark Green - #0330 - rgb(0,51,0)
Dark Purple - #66066 - rgb(102,0,102)
Dark Red - #8000 - rgb(128,0,0)
Dark Teal - #03366 - rgb(0,51,102)
Dark Yellow - #80800 - rgb(128,128,0)
Default Background - #FFFFFF - rgb(255,255,255)
Gold - #FFCC0 - rgb(255,204,0)
Green - #0800 - rgb(0,128,0)
Grey 25 - #C0C0C0 - rgb(192,192,192)
Grey 40 - #969696 - rgb(150,150,150)
Grey 50 - #808080 - rgb(128,128,128)
Grey 80 - #333333 - rgb(51,51,51)
Ice Blue - #CCCCFF - rgb(204,204,255)
Indigo - #333399 - rgb(51,51,153)
Ivory - #FFFFCC - rgb(255,255,204)
Lavender - #CC99FF - rgb(204,153,255)
Light Blue - #3366FF - rgb(51,102,255)
Light Green - #CCFFCC - rgb(204,255,204)
Light Orange - #FF990 - rgb(255,153,0)
Light Turquoise - #CCFFFF - rgb(204,255,255)
Lime - #99CC0 - rgb(153,204,0)
Ocean Blue - #066CC - rgb(0,102,204)
Olive Green - #33330 - rgb(51,51,0)
Orange - #FF660 - rgb(255,102,0)
Pale Blue - #99CCFF - rgb(153,204,255)
Periwinkle - #9999FF - rgb(153,153,255)
Pink - #FF0FF - rgb(255,0,255)
Plum - #993366 - rgb(153,51,102)
Red - #FF00 - rgb(255,0,0)
Rose - #FF99CC - rgb(255,153,204)
Sea Green - #339966 - rgb(51,153,102)
Sky Blue - #0CCFF - rgb(0,204,255)
Tan - #FFCC99 - rgb(255,204,153)
Teal - #08080 - rgb(0,128,128)
Turqoise - #0FFFF - rgb(0,255,255)
Turquoise - #0FFFF - rgb(0,255,255)
Unknown - #000 - rgb(0,0,0)
Very Light Yellow - #FFFF99 - rgb(255,255,153)
Violet - #80080 - rgb(128,0,128)
White - #FFFFFF - rgb(255,255,255)
Yellow - #FFFF0 - rgb(255,255,0)