In recent years inorganic sunscreens have become much used especially for fair skinned people and children where high sun protection factors are desirable. The major pigment used is titanium dioxide and the other pigment used is zinc oxide. For cosmetic acceptability these are used as ultra-fine dispersions and re-coated in various ways to minimise unwanted photoactivity. However, methods of assessing the photoactivity of such inorganic sunscreen dispersions are far from satisfactory and those that are available only assess the photo-oxidative capacity of the sunscreen. In this work new tests have been developed which assess the photo-reductive capacity of Ti02 and ZnO. These tests have been established so that they use simple equipment and are suitable for use in an industrial based quality control laboratory.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:643558 |
| Date | January 2001 |
| Creators | Guest, Patrick |
| Publisher | Keele University |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
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