Sunless tanning (also known as self tanning, fake tanning, or UV-free tanning) refers to applying chemicals to the body to produce an effect similar in appearance to a more traditional suntan. Sunless tanning arose in response to links between sun exposure and skin cancer discovered in the 1960s, along with other alternatives to natural sun tanning such as the use of a sunbed or tanning bed.The most effective products available are sunless tanning or self tanning lotions and sprays that contain dihydroxyacetone (DHA) as the active ingredient. The tan is not a dye, stain or paint, but a chemical reaction between the DHA and the amino acids in the dead layer on the skin surface.[citation needed] This is similar to a reaction well known to food chemists called the Maillard reaction.

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