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Masson Fontana stain showed variable positivity for melanin in the fungal hyphae.
The hyphae were intensely positive with Masson Fontana stain and negative with Pens stain.
A black, finely granular pigment, detected in 10 of 11 hepatic AMLs, was identified as melanin with the Fontana stain.
15,25) Melanin pigment has also been demonstrated in epithelioid cells by a Fontana stain or a Warthin-Starry stain at pH 3.