The recommended delay before showering following an indoor tanning session primarily concerns the stabilization of the ultraviolet light-induced reaction in the skin. Washing immediately after tanning may interfere with the complete absorption of bronzing agents and the natural tanning process that occurs within the skin’s melanocytes.
Allowing a sufficient interval post-tanning contributes to maximizing the color development and prolonging the tan’s duration. Historically, various opinions have existed regarding the optimal timeframe; however, current recommendations are based on understanding the skin’s physiological response to UV exposure and the time required for melanin oxidation.