Why do we use formalin to preserve animals?

Formalin is used to protect animals against infection. For complete discussion see the linkj:

http://www.wisegeek.com/what-is-formalin.htm

A solution of 35 to 40 per cent of water in formaldehyde or methanal is called formalin. Formaldehyde's formula is HCHO.

As formalin is a strong disinfectant and tissue hardener, it's used for preserving biological and anatomical specimens. It's also used as an antiseptic in sterilising surgical instruments.

Thanks Sarala for this information . From where did you collect this information?

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Formaldehyde is a chemical that is used in manufacturing many industrial products. There are many formaldehyde uses in day to day life.

We do not use formalin for preserving arthropods, only vertebrates. Specimens are not kept permanently in formalin since it is acidic and difficult to handle.

Although generally avoided for long-term storage, formalin may be used in instances where colour is important since alcohol dissolves most colours almost immediately.