Basic fuchsin is a precursor to which aldehyde staining reagent?

• A. Aldehyde fuchsin
• B. Masson trichrome
• C. Gomori trichrome
• D. Verhoeff

Answer: (A)

Basic fuchsin is used to form aldehyde fuchsin when it’s combined with an aldehyde source. This aldehyde-containing dye specifically reacts with elastic fibers, giving them a distinct purple-black color. That targeted reaction is what makes aldehyde fuchsin the reagent derived from basic fuchsin for elastic tissue staining. The other stains listed serve different purposes—Masson and Gomori trichromes are multi-dye connective tissue stains, and Verhoeff is another elastic-fiber staining method that relies on a different dye system.