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The ColorConstants dictionary provides keys for common colors.
If you need other colors, you can create
your own by sending the red:green:blue: class method to the
GraphicsTool class. The three arguments specify the intensity
of red, green, and blue in the color, on a scale that ranges from 0
to 255. In the following example, the answer produced,
6553600, is a large integer that represents dark blue.
*-- Red intensity
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| *-- Green intensity
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| | *-- Blue intensity
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v v v
GraphicsTool red: 0 green: 0 blue: 100