Acid brown are the dyes which are used to bestow brown color to different materials. These are the colors of low pH, which are also used to dye wool as well as cotton fabrics. These are functional as the food colorants and are utilized well in the medical field. This colorant is soluble in water and has empathy for amphoteric fibers. Acid brown colors are used to color the cellulose fibers and are used as the optimum quality and non-toxic dyes.