Embalming is the process of chemically treating human and animal remains to reduce decomposition and restore acceptable physical appearance. It originated in Egypt around 3200 BC and was later used by anatomists in the 15th century to preserve bodies for medical research. The modern embalming process involves arterial injection of embalming fluid containing formaldehyde, glutaraldehyde, or ethanol to sanitize and preserve the body. Additional cavity embalming and surface treatments may also be used. Embalming allows for public visitations and delays decomposition so the body remains suitable for study.