Newcomer Supply Carbol Fuchsin Stain, Kinyoun is used in the Kinyoun AFB Stain to demonstrate the presence of acid-fast mycobacteria in tissue sections. Carbol Fuchsin Stain, Kinyoun is a concentrated phenol and basic fuchsin solution that works to permeate the lipoid capsule of acid-fast organisms, rendering them resistant to acid alcohol decolorization.