UVA protection afforded by 6 different sunscreens with a sun protection fac
tor of 21 or more was compared by means of the persistent pigmentation dark
ening method. Colorimetric and visual assessment showed significant differe
nces in UV radiation-induced pigmentation at 2 hours. The labeled sun prote
ction factor of the tested sunscreens was not predictive of UVA protection
level.