In an H&E stain, nuclei appear red-brown. Which corrective action is appropriate?

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Multiple Choice

In an H&E stain, nuclei appear red-brown. Which corrective action is appropriate?

Nuclei should appear blue/purple in H&E because hematoxylin stains acidic nuclear components, and proper oxidation and blueing are needed for that classic color. If nuclei look red-brown, the hematoxylin solution is likely degraded or not properly prepared, so it isn’t delivering the expected nuclear stain. The appropriate fix is to replace the hematoxylin with a fresh, properly oxidized solution and then proceed with the usual differentiation and blueing steps to restore the blue nuclear color. Adjusting the bluing time wouldn’t fix a degraded dye that fails to stain nuclei correctly, and changing eosin staining or cutting thinner sections affects cytoplasmic color or tissue thickness rather than the nuclear stain quality.

Nuclei should appear blue/purple in H&E because hematoxylin stains acidic nuclear components, and proper oxidation and blueing are needed for that classic color. If nuclei look red-brown, the hematoxylin solution is likely degraded or not properly prepared, so it isn’t delivering the expected nuclear stain. The appropriate fix is to replace the hematoxylin with a fresh, properly oxidized solution and then proceed with the usual differentiation and blueing steps to restore the blue nuclear color.

Adjusting the bluing time wouldn’t fix a degraded dye that fails to stain nuclei correctly, and changing eosin staining or cutting thinner sections affects cytoplasmic color or tissue thickness rather than the nuclear stain quality.

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