Lipstick

Lipstick is a cosmetic applied to the lips to add color, shine, or texture. It typically combines pigments with oils, waxes, and emollients.

Cosmetic pigment: A finely divided coloring material used to give cosmetics hue and opacity. Pigments provide lipstick’s color and help determine its coverage.
Matte lipstick: Lipstick with a low-shine finish, often designed to deliver strong color. It emphasizes opaque color while minimizing reflected light.
Rheology: The study of how materials flow and deform under applied forces. Rheology describes how lipstick softens, spreads, and resists smearing.
Cosmetic regulation: The laws and standards governing the composition, labeling, and sale of cosmetics. Regulation sets requirements for lipstick ingredients, safety, and labeling.
Wax: A water-repellent material that is solid or pliable near room temperature and softens when heated. Waxes give lipstick a solid stick form and help it retain shape.
Lip gloss: A lip cosmetic that creates a glossy finish and may be clear or tinted. Gloss prioritizes shine and often feels less like a firm lipstick stick.
Suspension (chemistry): A mixture in which solid particles are dispersed through a fluid without dissolving. Many lipstick pigments remain dispersed in oils rather than dissolving.
Lead in lipstick: A public health concern about trace lead detected in some lipstick products. The issue illustrates how contamination testing and risk communication shape trust in lipstick.
Emollient: A substance that softens and smooths the skin by supporting its outer barrier. Emollients help lipstick glide on and reduce the feeling of dryness.
Lip stain: A lip color product designed to leave pigment on the lips after its carrier fades or wears away. Stains aim for lasting tint rather than lipstick’s coating of color.

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