Chrysoidin Agar with MUG (Oxgall Chrysoidin Agar with MUG) is recommended for the isolation and differentiation of Enterobacteriaceae and several other Gram negative rods. It can also be used for the identification of E. coli from clinical and non-clinical specimens.It is a partially selective differential medium recommended for isolation and differentiation of Enterobacteriaceae and several other Gram negative rods. Due to several biochemical reactions, it allows the morphological and color-based differentiation of a larger variety of bacterial colonies.