Scientists Develop Printable Water Sensor (IMAGE) Deutsches Elektronen-Synchrotron DESY Caption In the dry state (left; here in an anhydrous liquid) the sensor material is purple, in the wet state (e.g. from air humidity) it turns blue. The printed workpieces shown here are each about one centimetre wide. Credit UAM, Verónica García Vegas Usage Restrictions Free use by the media if reporting on the related paper. License Licensed content 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.