Food authentication (IMAGE) Purdue University Caption Purdue postdoctoral fellow Sungho Shin uses a portable LIBS spectroscopy instrument to collect data from the surface of an orange Credit Purdue University photo/Charles Jischke 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.