Cleavage products can be visualized on simple agarose gels or slab gel systems. Topical formulations of diphenhydramine are available, including creams, lotions, gels, and sprays. Abrasive exfoliants include gels, creams or lotions, as well as physical objects. Artificial dyes could be applied through powders, gels and bleach. Citric acid is used as an acidulant in creams, gels, and liquids. Topical (gels, creams or inhalers) or systemic steroids may be used to reduce inflammation. Increasing water concentration results in the formation of hydrated silica gels and colloidal silica dispersions. Temporary hair color is available in various forms including rinses, shampoos, gels, sprays, and foams. Some of these toothpastes contain peroxide, the same ingredient found in tooth bleaching gels. They come in many forms consisting of liquids, powders, gels, and pastes. Topical administration can also refer to vaginal administration of gels and creams however. These can be run in either agarose or polyacrylamide gels. Transdermal estradiol is available in the forms of patches, gels, emulsions, and sprays. There are several types of professionally applied fluoride gels and foams on the market. In solid-phase media, such as crystals, microcrystalline powders, gels, anisotropic solutions, etc.