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The WYSIWYG chart for checking ink levels and print quality without wasting ink -- the 16 primary HTML-named colors in HEX, RGB, HSL and CMY!
C yan * black b lue ~ M agenta * gray green *l ime ~ maroon

#00FFFF
rgb(0,255,255)
hsl(180,100%,50%)
cmy(100,0,0)

#000000
rgb(0,0,0)
hsl(0,0%,0%)
cmy(100,100,100)

#0000FF
rgb(0,0,255)
hsl(240,100%,50%)
cmy(100,100,0)

#FF00FF
rgb(255,0,255)
hsl(300,100%,50%)
cmy(0,100,0)

#808080
rgb(128,128,128)
hsl(0,0%,50%)
cmy(50,50,50)

#008000
rgb(0,128,0)
hsl(120,100%,25%)
cmy(100,50,50)

#00FF00
rgb(0,255,0)
hsl(120,100%,50%)
cmy(100,0,100)

#800000
rgb(128,0,0)
hsl(0,100%,25%)
cmy(50,100,100)

navy olive purple r ed ~ silver teal white Y ellow *

#000080
rgb(0,0,128)
hsl(240,100%,25%)
cmy(100,100,50)

#808000
rgb(128,128,0)
hsl(60,100%,25%)
cmy(50,50,100)

#800080
rgb(128,0,128)
hsl(300,100%,25%)
cmy(50,100,50)

#FF0000
rgb(255,0,0)
hsl(0,100%,50%)
cmy(0,100,100)

#C0C0C0
rgb(192,192,192)
hsl(0,0%,75%)
cmy(25,25,25)

#008080
rgb(0,128,128)
hsl(180,100%,25%)
cmy(100,50,50)

#FFFFFF
rgb(255,255,255)
hsl(0,0%,100%)
cmy(0,0,0)

#FFFF00
rgb(255,255,0)
hsl(60,100%,50%)
cmy(0,0,100)

abcdefghijklmnopqrstuvwxyz 0123456789 ABCDEFGHIJKLMNOPQRSTUVWXYZ
Monospace

Adjust your monitor for color correctness and print this page and see if your colors match!
CMY * colors are Cyan, Magenta and Yellow and are the inks mixed by printers to create all the other colors.
rgb ~ colors are Red, Green and Blue and are colors mixed by computer displays to create all the other colors.
{The named color lime represented by #00ff000 is the green in RGB}
Firefox : Print in Portrait, Shrink to Fit, Print Background Colors.
IE : Print in Portrait, Enable Shrink to Fit, Print Background Colors, Page Preview , 60%
Chrome : Save and Print the pdf with the Page Sizing set to Fit
Safari : I have not found out how to make this work in Safari
Version with larger Color Blocks