Extensive photo-stability tests have been
performed by exposing the substrate to different spectral
wavebands. Suitability for SPF evaluation has been investigated
by performing total absorbance measurements on seven sunscreens.
Results have then been correlated with the values declared
by the manufacturers. Evaluation of both photo-stability and water
resistance of the sunscreens has not been performed as it was out
of the scope of the study.