Simple Color Reaction Detects Diclofenac (image) Technische Universitaet Muenchen Caption Microtiter-plate with Diclofenac-ELISA at the laboratory of the TUM-Institute of Hydrochemistry. If Diclofenac is detected, the yellowish color fades and the concentration can be detected photometrically. Credit Picture: Andreas Battenberg / TUM Usage Restrictions free-to-use for reports on TUM 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.