hi,

there is some species of Citrobacter and Enterobacter , shows metallic green sheen on EMB agar medium.

For Reference you can see:

Levine M. "Differentiation of E. coli and B. aerogens on a simplified eosin methylene blue agar". 1918. J Infect Dis. 23: 43-47.

thanx for this question, I don't know other species can produce green metallic sheen on EMB

good luck

Klebsiella pneumoniae have been known to have a green metallic sheen

@ Brett

do you have any reference that says Klebsiella pneumoniae shows green metallic sheen

you will find species produce metallic sheen other than E coli in this site:

https://microbiologyjournal.org/comparative-evaluation-of-emb-agar-and-hicrome-e-coli-agar-for-differentiation-of-green-metallic-sheen-producing-non-e-coli-and-typical-e-coli-colonies-from-food-and-environmental-samples/

you will find species produce metallic sheen other than E coli in this site:

https://microbiologyjournal.org/comparative-evaluation-of-emb-agar-and-hicrome-e-coli-agar-for-differentiation-of-green-metallic-sheen-producing-non-e-coli-and-typical-e-coli-colonies-from-food-and-environmental-samples/