 surfactants are used to solubilize hydrophobic organic dyes, such as solvent and dispersed dyes. Nonionic surfactants have higher solubilization power than anionic or cationic surfactants, due to their ability to accommodate dyes in both the inner hydrocarbon part of the micelle and its head group shell. Additionally, the location of a dye within a surfactant micelle can be determined by examining its absorption spectrum. This article was authored by Ali Reza Tehrani Baga and Krister Holmberg.