Krutsay M
Pathologische Abteilung, Städtischen Krankenhauses Ajka, Ungarn.
Zentralbl Allg Pathol. 1988;134(6):583-5.
A modified method is described based on the following steps: 1. simultaneous mordanting, using an alcoholic solution of phosphotungstic acid and tannic acid, 2. treatment with pH = 10.4 silver nitrate solution, 3. physical development (one or two phases).