On what basis are blue-violet and red-violet identified?

Correct answer: Amounts of blue and red

The governing concept is the identification of tertiary colours by colour bias. Blue-violet and red-violet both lie between violet and a neighbouring primary colour on the colour wheel. A mixture or shade with a stronger blue influence is called blue-violet, while one with a stronger red influence is called red-violet. Black, white, and paper texture do not determine this colour-family name, so option B is correct.