Prussian Blue (image) FECYT - Spanish Foundation for Science and Technology Share Print E-Mail Caption This is Prussian blue. This salt could cause substances essential for life. Credit Nagem R. 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.