Differences in Water Color (IMAGE) Lund University Caption Differences in water color between surface waters are due to differences in the concentration and composition of organic matter as well as iron. The water in the glasses comes from natural waters within a distance of 35 kilometers in the county of Jönköping, southern Sweden. Credit Photograph by Stefan Löfgren Usage Restrictions None 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.