Which staining technique uses Bouin's to increase acidophilia?

• A. Masson's Trichrome technique
• B. Verhoeff's Van Gieson
• C. H&E
• D. Giemsa

Answer: (A)

Bouin's solution boosts acidophilia by making tissue components more receptive to acidic dyes, especially eosinophilic structures like cytoplasm and muscle. In Masson's Trichrome, this pre-fixation with Bouin's enhances the staining of these components so they appear bright red with the acid dye, while the connective tissue is stained blue by the subsequent dye. The Bouin's step also helps differentiate tissue elements more clearly, which is the hallmark of this technique.

The other stains don’t rely on Bouin's to boost acidophilia. Verhoeff's Van Gieson focuses on elastic fibers and uses its own stain sequence; H&E uses standard formalin fixation with hematoxylin and eosin; Giemsa is a Romanowsky-type stain used for smears and parasites with different fixation and dyes.