Recipe for Mummification

A plant oil – possibly sesame oil;
A “balsam-type” plant or root extract that may have come from bullrushes;
A plant-based gum – a natural sugar that may have been extracted from acacia;
crucially, a conifer tree resin, which was probably pine resin

When mixed into the oil, that resin would have given it antibacterial properties, protecting the body from decay.