Which preventive measure directly addresses slide drying in the context of this material?

• A. Allowing the slide to drain well before drying at 60C
• B. Moving to an unused blade section
• C. Retracting the block holder shaft
• D. Reembedding the tissue

Answer: (A)

The essential idea is managing surface moisture on the slide before heat drying to prevent drying artifacts. When a tissue section is placed on a slide, a film of water remains. If you immerse or place the slide directly into a 60°C drying step without allowing this excess water to drain, water can pool or evaporate unevenly. That leads to uneven drying, water spots, edge curling, and possible tissue lifting from the slide, all of which can compromise staining and overall slide quality.

Letting the slide drain well first lets most surface water run off, so the subsequent drying in the oven occurs more uniformly. This reduces the chance of moisture-related artifacts and helps the tissue adhere properly and dry consistently during the 60°C heat step.

Other options relate to different parts of the preparation process—sectioning technique, equipment adjustment, or reembedding the tissue—and do not directly address the moisture management needed for proper slide drying.