What should be done to make a blue-dominant violet?

Correct answer: Mix more blue and less red

The governing concept is proportional colour mixing. Red and blue combine to make violet, and the mixture takes on a blue-dominant appearance when blue is used in the greater proportion. Thus, adding more blue while using less red makes the result shift toward blue violet. More red would create a redder violet, yellow would move the mixture toward a different colour relationship, and equal yellow and blue produces green rather than violet.