Amazingly Green Synthesis Method for High-Tech Dyes (image) Vienna University of Technology Share Print E-Mail Caption At room temperature the dye indigo is completely water-repellent. A droplet of water easily pearls off. Credit © TU Wien Usage Restrictions None Share Print E-Mail 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.