Paint Particle (image) The Optical Society Caption Terahertz reflectometry reveals the paint surface's texture, which is produced by mica flakes added to the paint. Credit Applied Research & Photonics. Usage Restrictions Include caption & credit 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.