After Gomori Aldehyde Fuschsin technique for elastic, you notice no elastic fibers are stained on your control slide. What is the reason for this?

• A. Aldehyde Fuchsin is too old
• B. Aldehyde Fuchsin used too early and didn't give enough time to ripen
• C. Timing in Aldehyde Fuchsin solution is too short
• D. The slide was not deparaffinized

Answer: (A)

Elastic fibers in the Gomori aldehyde fuchsin method require a staining solution that has properly ripened to form the active dye complex that binds elastin. If the aldehyde fuchsin solution is too old, its chemical components can degrade or lose potency, so the stain no longer develops the deep purple color that marks elastic tissue. That degradation means the control slide will show no stained elastic fibers.

Some other issues can also affect staining—if the stain is not used at the right time (too early or too short) or if the slide isn’t deparaffinized, you’d see weak or absent staining for different procedural reasons—but the specific cause of no staining due to dye aging is consistent with the observed result.