2.3.2 The color messages

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$\begin{rail} color : 'color' ('r' 'g' 'b' \vert 'r' 'g' 'b' 'a') \end{rail}$

color sets an object color in the RGBA space. When A is not specified, the color is assumed to be opaque. Default color value is [0,0,0,255].