Enhancement of histological detail using metanil yellow as counterstain in periodic acid Schiff's hematoxylin staining of glycol methacrylate tissue sections.

Histological detail in sections from tissues embedded in glycol methacrylate was improved by counterstaining PAS/iron-hematoxylin stained sections with a dilute solution of metanil yellow. The addition of the counterstain increases contrast in tissue sections and highlights PAS-positive entities. The staining protocol provides sharp definition of tissue morphology, differentiates cell types and other tissue components and does not produce background staining.