What is the function of ferric chloride in the Verhoeff's Van Gieson technique?

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Multiple Choice

What is the function of ferric chloride in the Verhoeff's Van Gieson technique?

Explanation:
Ferric chloride acts as a differentiator in this staining method. The Verhoeff stain forms an iron-hematoxylin complex that colors elastic fibers black. After staining, a differentiating step with ferric chloride selectively removes the stain from non-elastic components, so only elastic fibers stay dark. The Van Gieson counterstain then colors collagen yellow and other tissues pink, producing a clear contrast with the black elastic fibers. It’s not primarily a mordant here, and the key role is to differentiate—to decolorize non-elastic elements while preserving the elastic fibers.

Ferric chloride acts as a differentiator in this staining method. The Verhoeff stain forms an iron-hematoxylin complex that colors elastic fibers black. After staining, a differentiating step with ferric chloride selectively removes the stain from non-elastic components, so only elastic fibers stay dark. The Van Gieson counterstain then colors collagen yellow and other tissues pink, producing a clear contrast with the black elastic fibers. It’s not primarily a mordant here, and the key role is to differentiate—to decolorize non-elastic elements while preserving the elastic fibers.

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