Spruce gum (IMAGE) University of Helsinki Caption From the right: unpurified spruce gum obtained from hot water extraction, spruce gum obtained from industrial streams, and purified spruce gum. Credit Mamata Bhattarai Usage Restrictions Image may only be used with appropriate credit. 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.