Golden Ball Mills (IMAGE) Ruhr-University Bochum Caption Gold-lined grinding bowls can catalyse reactions without solvents. Credit RUB, Marquard Usage Restrictions The image may only be used in the context of the press release "Golden Ball Mills as Green Catalysts" published by RUB on June, 17, 2024. License Original 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.