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Best Answer

The answer depends in part on your application. Also, 'best' in what sense?

Formaldehyde is a very effective preservative for biological specimens, but is not suitable as a food preservative if you intend to eat the food, as it is quite toxic.

Copper compounds are excellent wood preservatives, but are also quite toxic.

If you are looking for a non toxic food preservative, try salt or vinegar!

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Q: What is the best preservative?
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