Even though they are sometimes confused, tinted oils, glosses and lip inks are different products that are not formulated in the same way. The tinted oils are based on a base of plant-derived or synthetic lipids with good skin affinity and capable of restoring the lips' hydrolipidic film. They often contain oils such as jojoba, castor or sweet almond, rich in unsaturated fatty acids, as well as lightweight esters that give a non-greasy finish. Tinted oils also contain dispersed pigments responsible for the colour effect. Finally, tinted lip oils include film-forming agents, which aid product spreadability and its ability to retain moisture in the skin. These ingredients also help to thicken the formula of tinted oils, creating a smooth, silky texture that glides easily over the lips.
Glosses are formulated around a gelled or polymeric phase. Their viscous texture often derives from silicone- or cellulose-based polymers that trap pigments and pearlescent particles while forming a glossy film on the lip surface. Mineral or plant oils are present in varying amounts to enhance the product’s slip properties. Some “treatment” glosses are enriched with humectants to improve application comfort. However, the majority remain designed for a luminous finish rather than reparative action.
Finally, lip stains rely on an aqueous or hydroalcoholic phase in which the pigments are dispersed with the aid of surfactants. Their lightness stems from the presence of volatile solvents, which evaporate rapidly to leave on the lips a fine coloured layer. It is this specific formulation, composed of water-soluble pigments, film-forming polymers and one or more volatile solvents, that is responsible for the long-lasting wear of lip stains, but also for their slightly drying effect on the lips, although some recent products tend to incorporate light moisturising agents, such as pentylene glycol or lactic acid derivatives.
The composition of each product determines its texture, its wear and its benefits: tinted oils focus on nourishment, glosses on shine, and lip inks on the long-lasting fixation of pigments.