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Color Selector...

▪ Color Selector lets you interactively select a color for Mathematica graphics. (Macintosh only)
▪ When you have chosen a color, click OK to paste the selected color at the text insertion point, cell insertion point, or selection within a cell, in the form of a Mathematica RGBColor[ red , green , blue ] function. In this way you can specify the color of a graphical object without having to figure out the actual RGB values for the color yourself.