Mercurius cyanatus
By James Tyler Kent — Lectures on Homoeopathic Materia Medica
Given a Merc. base and diphtheria, when the membrane is greenish and inclined to spread through the nose and involve a large surface, the Cyanide of Mercury is needed.
It has exudation more marked than any other form of Mercury .
Malignant forms of diphtheria, rapidly forming, and with phagedenic ulceration.