Answer:
''Natron, a disinfectant and desiccating agent, was the main ingredient used in the mummification process. ... By removing the organs and packing the internal cavity with dry natron, the body tissues were preserved. The body was filled with Nile mud, sawdust, lichen and cloth scraps to make it more flexible.'' (google)
Step-by-step explanation:
I did a search on Google and I found this. Hopes it helps.