Webnew research uncovers the science behind why the body's tanning process does not occur immediately after sun exposure, but only after a few hours or even days. These products utilize dihydroxyacetone. Webdon’t fall for these five dangerous tanning myths. Webthe sun provides you with vitamin d, but its rays also pose a threat to your skin. You get tan when your skin comes into contact with ultraviolet. Webin today's post, we'll explore the science behind tanning and explain how you can get the best of both worlds by tanning 'safely'. Weba study has elucidated the science behind the delayed tanning process observed after sun exposure. The body’s initial response is to repair dna damage in. Webmost people will tan within 1 to 2 hours in the sun. It’s important to remember that both burns and tans may take a while to set in, so if you don’t see color.