Endo agar
Endo agar (also called Endo's medium) is a microbiological growth medium with a faint pink colour. Originally developed for the isolation of "Salmonella typhi", it is now used mostly as a coliform medium. Most gram-negative organisms grow well in this medium, while growth of gram-positive organisms is inhibited. Coliform organisms ferment the lactose in this medium, producing a green metallic sheen (i.e. "Escherichia coli"), whereas non-lactose-fermenting organisms produce clear, colourless colonies, i.e. "Salmonella" sp.. Typical composition. Endo agar typically contains (w/v):