In embalming, camphor oil was one of the ingredients used by ancient Egyptians for mummification. The Egyptians cleansed body cavities in the mummification process with frankincense and natron. Their efforts are the mythic prototype for mummification and other ancient Egyptian funerary practices. Egyptian embalmers began to achieve "true mummification" through a process of evisceration. The Chinchorro were famous for their detailed mummification and funerary practices. Details of the mummification ritual of the sacred bull are written within the Apis papyrus. The particulars of the mummification ritual often differed. Much of this early experimentation with mummification in Egypt is unknown. Intentional mummification in pre-Columbian Mexico was practiced by the Aztec culture. There are also hieratic texts written on cloth, especially on linen used in mummification. Potassium acetate is used in mixtures applied for tissue preservation, fixation, and mummification. Especially singular was the cult to the dead, practicing the mummification of corpses. These more isolated examples include mummification, private burial houses, abandoned houses, etc. The finds are notably for revealing the form of mummification practiced by the Scythians. This includes the burying of elites in large structures and the use of extensive mummification.