Fake tan works by using UV-free ingredients to react with the outer layer of skin, creating a temporary colour effect. Outlets also explain that the characteristic odours people notice—described as cookie-like, biscuity, or toast-like—come from the same chemical processes that drive the tanning colour.
Both sources place the discussion in a wider context of chemistry and skin biology. Phys.org contrasts fake tanning with real tanning by noting that natural tans involve UV-triggered pigment production in living skin, and that UV exposure can raise skin-cancer risk. The Conversation instead frames fake tan through everyday cooking analogies, describing the sugar-and-amino-acids chemistry behind the colour as similar to transformations that occur during cooking. Together, the coverage highlights both the mechanism of the cosmetic effect and why smell can vary while pointing to different angles—skin-safety context versus cooking-style explanation of the reactions.
