Many surfactants and detergents (e.g. sodium lauryl sulfate) are sulfate derivatives. Anionic softeners can combine with anionic surfactants directly. Mixtures of surfactants are often used, including mixtures of anionic with nonionic surfactants. Skin irritancy generally increases in the series non-ionic, amphoteric, anionic, cationic surfactants. The lipid core is stabilized by surfactants (emulsifiers). Fatty alcohols are mainly used in the production of detergents and surfactants. These include mixtures of phosphoric and hydrofluoric acids as well as surfactants. Laundry detergents contain a mix of ingredients including surfactants, builders, optical brighteners, etc. The negative charge is further increased by the adsorption of anionic surfactants. Triethanolamine is used primarily in making surfactants, such as for emulsifier. Decanol is used in the manufacture of plasticizers, lubricants, surfactants and solvents. Most detergents contain ingredients that counteract the effects of hard water on the surfactants. Synthetic foams are based on synthetic surfactants. Performance Products manufactures products primarily based on amines, carbonates, surfactants, and maleic anhydride. These compounds can act as surfactants or foaming agents.