Spray is a unique and safe tanning experience, through an ingredient called DHA Dihydroxyacetone, DHA is a colorless sugar that darkens the skin by staining. It interacts with the dead surface cells found in the epidermis, or the outermost layer of the skin, producing a color change. As the dead skin cells are naturally sloughed off, the color gradually fades, typically within 5 to 7 days of application. DHA is often derived from plant sources such as sugar beets and sugar cane, and by the fermentation of glycerin. DHA does not damage the skin, and is considered a safe skin coloring agent and nutritional supplement DHA was first recognized as a skin coloring agent by German scientists in the 1920s. Through its use in the X-ray process, it was noted as causing the skin surface to turn brown when spilled... By the 1980s new sunless tanning formulations appeared on the market, and refinements in the DHA manufacturing process created products that produced a more natural looking color and..