Isopropanol is a good substitute for ethanol for dehydration during processing but not for use in staining procedures. Which statement best reflects this use?

• A. Yes, for dehydration and staining
• B. Yes, for dehydration but not for staining
• C. No, it should not be used at all
• D. It is only used as a clearing agent

Answer: (B)

The main idea here is solvent suitability for different steps in histology: dehydration versus staining. Isopropanol can effectively replace ethanol during the dehydration steps because it mixes with water and removes water from tissue, allowing paraffin infiltration to proceed. But staining relies on dye chemistry that generally requires aqueous environments or specific solvent conditions that align with how dyes interact with tissue. Isopropanol’s polarity and solvent strength can alter dye penetration or binding, and residual isopropanol can interfere with stain reactions. Therefore, it’s appropriate to use isopropanol for dehydration, while staining should not rely on it. This is why the statement “Yes, for dehydration but not for staining” best reflects its use.