Editing Coliform bacteria (section)

==== Violet red bile agar ====
The solid medium is used to grow lactose-fermenting coliforms and utilizes a neutral red [[pH indicator]]. Pink colonies appear when lactose is fermented and are surrounded by [[bile]] that has [[Precipitation (chemistry)|precipitated]] out. To confirm if these colonies are coliforms, they are transferred to brilliant green lactose bile (BGLB) and incubated. If gas is visible after incubation, it can be confirmed that the sample had coliforms present.<ref name=":2">{{Citation |title=Water quality. Enumeration of Escherichia coli and coliform bacteria |url=http://dx.doi.org/10.3403/bseniso9308 |publisher=BSI British Standards |doi=10.3403/bseniso9308 |access-date=2022-03-03|url-access=subscription }}</ref>