[Figure 1] (IMAGE) DGIST (Daegu Gyeongbuk Institute of Science and Technology) Caption Color change by the substance change around sensor and the result of substance categorization by the refractive sensitivity of sensor Credit ©DGIST 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.