Which fixative is considered a substitute for B5?

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Multiple Choice

Which fixative is considered a substitute for B5?

Explanation:
B5 is a fixative designed to give excellent tissue morphology and nuclear detail, but it uses picric acid, which poses hazards and staining issues. Zinc formalin provides a substitute because it cross-links proteins just as well for preserving structure, while zinc salts help maintain crisp morphology and reliable staining. It avoids the yellow artifact and hazards associated with picric acid, yet still works well with routine paraffin embedding and hematoxylin and eosin staining. The other options don’t replicate the combination of strong preservation and staining quality that B5-like fixatives aim for—formalin alone and buffered formalin lack the same fixative balance, and ethanol acts more as a dehydrant with different fixation properties.

B5 is a fixative designed to give excellent tissue morphology and nuclear detail, but it uses picric acid, which poses hazards and staining issues. Zinc formalin provides a substitute because it cross-links proteins just as well for preserving structure, while zinc salts help maintain crisp morphology and reliable staining. It avoids the yellow artifact and hazards associated with picric acid, yet still works well with routine paraffin embedding and hematoxylin and eosin staining. The other options don’t replicate the combination of strong preservation and staining quality that B5-like fixatives aim for—formalin alone and buffered formalin lack the same fixative balance, and ethanol acts more as a dehydrant with different fixation properties.

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