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Why do modern embalmers use cavity fluid?

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surgeon; American Civil War — embalming An embalming surgeon at work on a soldier's body during the American Civil War.

In modern embalming, cavity fluid is used to preserve the internal organs and tissues within the body's cavities. During the procedure, this fluid is injected into the body cavities after the removal of internal gases and fluids via a long, hollow needle known as a trocar.1

The primary purpose of using this preservative—which is typically composed of Formalin mixed with alcohols, emulsifiers, and other substances—is to prevent the body from shriveling or discoloring. Ultimately, the goal of modern embalming is to provide a lifelike appearance for the deceased during the period in which the body is viewed by mourners.1