Which fixative contains Formaldehyde, Ethyl Alcohol, and DI Water, with dehydration started during fixation?

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Multiple Choice

Which fixative contains Formaldehyde, Ethyl Alcohol, and DI Water, with dehydration started during fixation?

Explanation:
Dehydration during fixation happens when the fixative itself includes a dehydrating solvent, like ethyl alcohol. In Formalin Alcohol, formaldehyde is dissolved in ethyl alcohol and water, so water in the tissue is replaced by alcohol right away. This means dehydration begins during fixation itself, which is why this fixative fits the description. The other options don’t have ethanol in the fixative (they’re aqueous formalin-based or use different aldehydes without the dehydrating alcohol), so dehydration does not start during fixation with them.

Dehydration during fixation happens when the fixative itself includes a dehydrating solvent, like ethyl alcohol. In Formalin Alcohol, formaldehyde is dissolved in ethyl alcohol and water, so water in the tissue is replaced by alcohol right away. This means dehydration begins during fixation itself, which is why this fixative fits the description. The other options don’t have ethanol in the fixative (they’re aqueous formalin-based or use different aldehydes without the dehydrating alcohol), so dehydration does not start during fixation with them.

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