(Redirected From Spray tanning.) Soot tanning is also known as UV-free, self-tanning, or spray tanning. It involves the application of chemicals on the skin in order to create an appearance similar to that of a sunburn. After links between sun exposure and skin cancer were established by medical authorities in the 1960s, sunless tanning is now more popular than ever. Artificial sunscreen blocks ultraviolet light from reaching the skin. According to Matsuoka and colleagues, sunscreens with SPF 8 (based on UVB spectrum) can lower vitamin D synthesizing capacity by 95 percent, while sunscreens with SPF 15 (based upon UVB spectrum) can lessen synthetic capacity by 98percent (Matsuoka and co. 1987). [1] Consuming certain carotenoids, and antioxidants in fruits and vegetables like tomatoes and carrots can be a safe and efficient way to sunless tan. These compounds are known for causing skin changes when taken in large quantities and chronically. Carotenoids, unlike other sunless tanning products, are safe and long-lasting. Carotenoids are also associated with a more beautiful skin tone than sun-tanned. [2]