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Litmus Milk Test


Materials Required:




24-48 hourstryptic soy broth cultures of organisms




Litmus milk broth (pH-6.8)
Skim milk powder   100g
Litmus                       0.075g
Distilled water          1,000.0ml
 Autoclave at 12lb pressure for 15 minutes




  • Bunsen burner
  • Inoculating loop
  • Test tube rack
  • Marking pen




  1. Using sterile technique, inoculate each experimental organism into its appropriately labeled tube by means of a loop inoculation. The last tube will serve as a control.
  2. Incubate all cultures for 24 to 48 hours at 37˚C.





  1. Litmus milk is a complex medium that can produce a diversity of results. Because of this, litmus milk can give quite unreliable results (i.e., the results often give negative results when something positive should happen). Thus, you would be advised to use litmus milk as a confirmatory test but not a definitive test (except as a last resort).
  2. A clot formation is simply recorded as “clot” and cannot clearly differentiate between a clot and curd formation in this medium.




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