When hair appears violet, what color is used to balance it?

In color theory, particularly in the context of hair coloring, understanding complementary colors is essential. When hair takes on a violet hue, the best way to neutralize that tone is by introducing its complementary color, which in this case is yellow.

Violet is located opposite to yellow on the color wheel, which means yellow effectively balances out and counteracts the violet tones. This is due to the principle that complementary colors cancel each other out when mixed, resulting in a more neutral appearance.

Using yellow in a formulation will help to correct the unwanted violet shades, leading to a more balanced and natural hair color. The other colors listed do not counteract violet effectively, as green is opposite red, blue is opposite orange, and red is opposite green in the color wheel, making them unsuitable choices for this specific situation.