Which stain yields elastic fibers deep blue to purple?

• A. Aldehyde Fuchsin Stain
• B. Verhoeff's Elastic Stain
• C. Mallory's Phosphotungstic Acid-Hematoxylin
• D. Oil Red O Method

Answer: (A)

Elastic fibers are best visualized with stains that specifically bind to elastin. Aldehyde fuchsin contains aldehyde-reactive components that attach to elastin, producing a vivid deep blue to purple color that makes elastic fibers stand out clearly against surrounding tissue. This selective affinity is what sets it apart for highlighting elastic tissue. In contrast, Verhoeff’s elastic stain also targets elastic fibers but typically yields a black to dark color rather than blue to purple. Mallory’s phosphotungstic acid-hematoxylin emphasizes other tissue elements like collagen and general connective tissue patterns rather than elastin specifically, and Oil Red O stains lipids and is used on frozen sections, not for elastic fibers. So for deep blue to purple visualization of elastic fibers, aldehyde fuchsin is the appropriate choice.