Contrary to what is seen in movies and television series, a corpse is never completely dissolved in acid.
The reason lies in the fact that the human body is not homogeneous and is composed of different substances, not all of which can be attacked by acid.
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In some cases it would be necessary to use basic and non-acidic substances, such as caustic soda for example.
If we only used hydrochloric acid, as in Breaking Bad , there would always be tendons and muscles that would require a basic substance to be dissolved.
