Which one of the following is an example of a secondary color?

A secondary color is created by mixing two primary colors. In color theory, the primary colors are red, blue, and yellow. When two of these primary colors are combined, they produce the secondary colors.

Orange is formed by mixing red and yellow, making it a secondary color. Green, which results from mixing blue and yellow, and purple, which comes from mixing blue and red, are also secondary colors. However, blue is a primary color itself and does not fit the definition. Therefore, the correct answer highlights orange as an example of a secondary color. Understanding the relationship between primary and secondary colors is essential in various fields, including esthetics, as colors can significantly affect mood and perception in beauty treatments.