Cold Sintering 2 (IMAGE) ETH Zurich Caption This is a sample of cold sintered calcium carbonate (sample diameter: 2 centimeters). Credit ETH Zurich / Peter Rüegg Usage Restrictions Reporting about this ETH Zurich research 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.