Figure 3: ELISA screening of Chloramphenicol: a) The samples and standards being added to the ELISA wells, b) The ELISA wells showing the change in color to blue once the substrate is added to the wells, c) Picture depicting the color change from blue to yellow when stop solution is added to the ELISA wells, and d) ELISA plate just before the measurement of optical density values using a BioTek ELISA reader and intensity of this color depicts the presence or absence of the Chloramphenicol.