Spray Tanning is an alternative to UV tanning that requires a solution to be applied to the skin and requires no UV rays. Spray tanning solutions contain a natural tanning agent called DHA (dihydroxyacetone). This ingredient reacts to the proteins in the outermost layers of the skin to produce a beautiful bronze color. The solution is not a stain, paint, or dye. The active ingredient in the solution is clear, however some spray tan solutions have a cosmetic bronzing additive, and this additive will rise away revealing the color produced. After the sunless application, the skin will begin to darken in about 3-4 hours and the tan will continue to develop for up to 24 hours. The tan will last approximately 5-7 days. There are specific steps to take in order to maximize the life of the tan.