Overstaining in iron hematoxylin leads to extremely dark nuclei in Masson Trichrome. Which action corrects this?

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Multiple Choice

Overstaining in iron hematoxylin leads to extremely dark nuclei in Masson Trichrome. Which action corrects this?

Shortening the time the tissue spends in iron hematoxylin directly reduces how much nuclei stain and lightens the overly dark nuclei. Iron hematoxylin is the nuclear stain in Masson Trichrome, and if the stain duration is too long, nuclei become excessively blue-black and lose detail. Reducing that staining time lowers the stain uptake to the desired level. Increasing washing might remove some surface color but won’t fix stain that’s already bound; using Bouin's fixative can actually intensify staining in this context; fresh reagents help with consistency but don’t correct overstaining.

Shortening the time the tissue spends in iron hematoxylin directly reduces how much nuclei stain and lightens the overly dark nuclei. Iron hematoxylin is the nuclear stain in Masson Trichrome, and if the stain duration is too long, nuclei become excessively blue-black and lose detail. Reducing that staining time lowers the stain uptake to the desired level. Increasing washing might remove some surface color but won’t fix stain that’s already bound; using Bouin's fixative can actually intensify staining in this context; fresh reagents help with consistency but don’t correct overstaining.

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