Tiles (image) University of California - Riverside Caption At left are two tiles coated with the titanium dioxide mixture. At right are uncoated tiles. At the top is a commercially available tile with titanium dioxide. Credit UC Riverside Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.