In the Verhoeff-Van Gieson stain, elastic fibers appear very dark and do not contrast with the background. Which of the following is a documented cause?

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In this stain, elastic fibers should drink in the dark color from Verhoeff’s hematoxylin while the background takes on a contrasting pink/yellow from the Van Gieson counterstain. The differentiation step after staining is what makes the background lighter than the elastic fibers. If the slide is underdecolorized, the background keeps the hematoxylin stain, so it darkens along with the elastic fibers and the contrast between them is lost. That’s why the fibers appear very dark and do not stand out from the background. Other issues, like overcolorizing the background or overstaining, create different patterns of color in the background or fibers, but the specific loss of contrast with persistent background staining points to insufficient decolorization.