If only mixing blue and red did always produce purple. Anyone that has mixed color whether with paint or dye or clay knows that what when you mix two colors the result may not always be what you expect but that's a post for another day.
The design shown above is blue ink printed on a red tee visually producing purple. The designer's tongue-in-cheek saying cleverly plays on a phrase that is often over used by the media when talking about color.
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