If a mixture of blue and orange appears too blue, what should be added?

Correct answer: Orange

The governing concept is correcting the proportion of two complementary pigments. Blue and orange oppose each other on the colour wheel. When the mixture is too blue, adding a small amount of orange increases the underrepresented component and reduces the blue bias, making the colour more balanced and muted. Therefore option C is correct. Red or yellow alone changes the hue, while white mainly lightens the mixture without neutralising the excess blue as directly.