This section is from the book "Dental Medicine. A Manual Of Dental Materia Medica And Therapeutics", by Ferdinand J. S. Gorgas. Also available from Amazon: Dental Medicine.
Microcidin is a combination of naphthol and soda. Naphthol 25 per cent. and sodium naphtholate 75 per cent, one part being soluble in three parts of water. Micro-cidine does not corrode instruments or dressing materials, and is without odor or taste.
Microcidin has a very feeble toxicity, is caustic in large quantities, but in medicinal doses, even the largest required, is not irritating when applied to wounds as an antiseptic and disinfectant; it may also be used for toilet purposes. It reduces fever rapidly, and is excreted by the urine, which is rendered aseptic. It has been employed successfully in a large number of cases of infected and operative wounds. It is used in aqueous solution in the strength of 5 to 1000 (strong solution) and 3 to 1000.
As an antiseptic and disinfectant, microcidin may be employed in dental practice on gangrenous pulps, carious cavities in pulp canals, and wounds and ulcers of mucous membrane ; and as a disinfectant and antiseptic generally.