Internal organs were usually removed during mummiﬁcation and placed in
containers known as canopic jars, or wrapped with the mummy. The brain
was discarded but the heart was usually left inside the body. The
mummiﬁcation process itself was complicated and it took around 70 days
between death and interment to prepare a corpse for burial – much of
this time was spent drying out the deceased. Natron (a compound of
sodium carbonate and sodium bicarbonate) was used to dehydrate the body.