Color of Cosmetic
Pigments and dyes are used in products to impart a color. Titanium dioxide (TiO2) is a white pigment that is mined. In combination with natural mined and synthetic iron oxides, which range in color from red, yellow, black and brown, depending upon the degree of oxidation and hydration, a range of color can be produced that will be suitable for almost every skin tone. Face powders are produced by blending inorganic oxides and fillers. Fillers are inert, generally inexpensive materials such as kaolin, talc, silica, and mica that are used to extend and fully develop colors. Pressed powders like eyeshadows and blushers are prepared by blending additional binding ingredients such as oils and zinc stearate and pressing the mixture into pans.
Eyeshadows and lipsticks often contain pearlescent pigments commonly called pearls. Pearls sparkle and reflect light to produce a multitude of colors. They are prepared by precipitating a thin layer of color on thin platelets of mica. Varying the thickness of the color deposited changes the angle of light refracted though the composite, creating different colors.
Organic pigments are used to color lipsticks and eyeshadows. When organics are precipitated on a substrate they are called lake pigments. The term lake refers to the laking or precipitating of the organic salt onto a metal substrate such as aluminum, calcium, or barium. They are called D&C (drug and cosmetic) and FD&C (food, drug and cosmetic) colors. Some examples are D&C Red#7 calcium lake and FD&C Yellow #5 aluminum lake. Dyes such as FD&C Blue#1 and D&C Yellow #10 are readily soluble as opposed to pigments, which are insoluble. Dyes are useful in providing tints for lotions, oils, and shampoos.
Last edited by Oleks; Aug 1, 08 at 05:24.