The last dehydrating absolute alcohol in the H&E staining setup is very pink. This indicates that the alcohol

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Multiple Choice

The last dehydrating absolute alcohol in the H&E staining setup is very pink. This indicates that the alcohol

Explanation:
Absolute alcohol used for dehydration should be colorless and essentially free of water. A pink tint in the last dehydrating step signals water has contaminated the alcohol. Water in the dehydrant means the tissue isn’t being fully dried, which can alter how stains behave and may cause dye (such as eosin) to leach into or be carried by the alcohol, producing the pink color. This artifact tells you the batch isn’t truly anhydrous and should be replaced with fresh absolute alcohol (and the system checked for moisture sources). Overheating would produce other artifacts, and dye impurities would more likely cause a different color pattern not specifically tied to the hydration status.

Absolute alcohol used for dehydration should be colorless and essentially free of water. A pink tint in the last dehydrating step signals water has contaminated the alcohol. Water in the dehydrant means the tissue isn’t being fully dried, which can alter how stains behave and may cause dye (such as eosin) to leach into or be carried by the alcohol, producing the pink color. This artifact tells you the batch isn’t truly anhydrous and should be replaced with fresh absolute alcohol (and the system checked for moisture sources). Overheating would produce other artifacts, and dye impurities would more likely cause a different color pattern not specifically tied to the hydration status.

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