Textile dyes can present a health hazard to the user. Besides the obvious problem from highly corrosive acids and bases used in some dyeing processes, the dyes themselves are potentially carcinogenic. There are several types of dyes, classified chemically and by dyeing procedure, including acid dyes, azoic dyes, basic dyes, direct dyes, disperse dyes, fiber reactive dyes, mordant dyes, oxidation base dyes, vat dyes, and fluorescent brightening agents. Textiles are also colored by pigments in processes where the affinity of the coloring matter for the fiber is supplied by a resin binder.