It's principle is lactose fermentation...Lactose fermenters metabolise the lactose in the media and produce acid byproducts, causing a color change in the colony.
Strong acid production by organisms such as E. coli results in a metallic green sheen.
Weaker fermentation of lactose results in colonies with a pinkish-purple color. Colonies of nonlactose fermenters remain colorless, or at least are no darker than the color of the media.
Therefore, it shouldn't look yellow:-(
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