Incomplete dehydration most directly compromises which aspect of H&E staining?

• A. Nuclear detail
• B. Cytoplasmic color
• C. Overall tissue thickness
• D. Stain uniformity across sections

Answer: (A)

Incomplete dehydration leaves residual water in the tissue, which disrupts paraffin infiltration and can cause swelling or distortion. Hematoxylin stains nuclei by binding to DNA, so crisp nuclear detail depends on preserving nuclear morphology and allowing the stain to access the chromatin evenly. When water remains, nuclei become less distinct and nuclear borders blur, making nuclear detail the most directly compromised aspect. Cytoplasmic color (eosin) can be affected as well, but the primary and most noticeable impact of improper dehydration is on the clarity of nuclear detail.