Which colour is generally formed by mixing red and blue acrylic colours?

Correct answer: Violet

The governing concept is traditional subtractive colour mixing with pigments. Red and blue are treated as primary colours in the school colour model; when they are mixed, they produce violet, a secondary colour. The precise result may lean toward purple or a darker violet depending on the pigments and their proportions. Green comes from yellow and blue, orange from red and yellow, and yellow is not produced by this pair. Thus option C is correct.