sphere to block out sunscreen product fluorescence.
This could alter the absorbance spectrum. In order to check for
fluorescence effect, additional measurements of sunscreen absorbance
have been performed by introducing different interferential
filters between the sunscreen/substrate and the integrating
sphere. In all these cases the results were compatible with those
obtaied without the filters.
This confirms that fluorescence does
not affect the measured absorbance values. Moreover, the
chemical composition of the sunscreens tested has been analyzed
and no fluorescence ingredients have been found