Phenol coefficient indicates
On exposure to air, the colorless crystals of phenol become pinkish and on longer exposure, the color deepens to dark blue. Pure phenol is not an effective disinfectant. It is used as an effective disinfectant. Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 140
Efficacy of a disinfectant
Dilution of a disinfectant
Quantity of a disinfectant
Purity of a disinfectant
Epidemiology