Which one of the following is known as a primary color?

In the context of color theory, primary colors are the foundation from which all other colors are created. The primary colors in additive color mixing, which pertains to light, are red, green, and blue. In subtractive color mixing, often used in pigments and paints, the primary colors are typically red, yellow, and blue.

Red is specifically classified as a primary color in both systems of color mixing. This is because red cannot be created by mixing other colors together; it stands alone as a fundamental hue. When it comes to creating a wide range of other colors, primary colors like red are essential; they can be combined with other colors to produce secondary colors (like purple, orange, and green in the subtractive system) and tertiary colors.

Understanding primary colors is vital for estheticians, as they apply principles of color theory in various aspects, such as choosing pigments for cosmetic applications or understanding color harmony in makeup artistry.