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Blue
,'''Blue''' is one of the three primary pigments, along with [[red]] and [[yellow]], and one of the three main colors of light along with red and [[green]]. With [[pigment]]s, such as with paint, blue is combined with yellow to make [[green]], or with red to make [[purple]].
In US [[politics]], blue is the color of the [[Democrats]]. It is sometimes associate with wealth, such as in the terms [[blue blood]] and [[blue chip]]. Elsewhere in the world the colour blue represents [[conservatism]].
The color blue corresponds to [[wavelength]]s of 435 nanometers to 500 nanometers in the [[electromagnetic spectrum]].<ref>http://hyperphysics.phy-astr.gsu.edu/hbase/vision/specol.html#c1</ref>
