Red paper, which changes colour to blue in the pH range 3.0 – 5.0.

Congo paper is supplied in three versions of varying sensitivity:
Congo paper MN 816 N        - normal sensitivity
Congo paper MN 260 HE      - high sensitivity
Congo paper MN 616 T - medium sensitivity, between the above two types, recommended
specifically for spot tests.

Recommended application:
Neutralisation analysis; detection of lactic acid in culture media, which contain lactic acid-producing strains of B. coli.