Why is formalin used for preserving fish specimens?
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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 is used for preserving biological and anatomical specimens.It is also used as an antiseptic in sterilising surgical instruments.
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