For white spots after deparaffinization, which corrective action is recommended?

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Multiple Choice

For white spots after deparaffinization, which corrective action is recommended?

White spots after deparaffinization usually come from the dewaxing step not removing all paraffin, often due to solvent issues. Xylene must effectively dissolve paraffin; if the xylene is contaminated or degraded, it won’t dissolve wax properly, leaving residues that appear as white spots after rehydration and staining. The best corrective action is to check the xylene and replace it with fresh, clean solvent to restore complete dewaxing. Other approaches, like just lengthening drying time, extending exposure to xylene, or using a fresh stain, won’t address a contaminated solvent and won’t reliably fix the dewaxing problem.

White spots after deparaffinization usually come from the dewaxing step not removing all paraffin, often due to solvent issues. Xylene must effectively dissolve paraffin; if the xylene is contaminated or degraded, it won’t dissolve wax properly, leaving residues that appear as white spots after rehydration and staining. The best corrective action is to check the xylene and replace it with fresh, clean solvent to restore complete dewaxing. Other approaches, like just lengthening drying time, extending exposure to xylene, or using a fresh stain, won’t address a contaminated solvent and won’t reliably fix the dewaxing problem.

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