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DHA
The primary ingredient used in most spray-on tanning equipment today is called dihydroxyacetone (DHA). DHA, a colorless sugar, interacts with the outermost layer of the skin to darken skin color in a period of several hours. It takes about 12-24 hours for the DHA in your skin to reach its full tanning potential and a spray-on tan can last as long as 7-10 days.
Notice
Spray-on tanning does not offer any photoprotection (sunburn protection).