Final answer:
Adding fluorescent pigments is not a procedure used in mixing cosmetics to match skin tone, as subtractive color mixing with pigment colors like magenta, yellow, and cyan is used instead.
Step-by-step explanation:
The procedure not used in mixing cosmetics to match skin tone is adding fluorescent pigments. This is because cosmetics mixing for skin tones typically involves subtractive color mixing, which follows the rules of combining pigmented substances like foundation or powder types. These procedures can include color testing on a small area of the skin, mixing complementary colors, and using color wheels to determine which shades will best match the skin tone of an individual. The subtractive color model involves mixing colors like magenta, yellow, and cyan (primary pigment colors) to achieve a desired pigment.
In contrast, additive color mixing involves combining colors of light (e.g., red, green, and blue light), which follows a different set of principles. While fluorescent pigments may be bright and vivid under certain lights, they do not typically contribute to a natural skin tone match in cosmetics.