What substance was used to stuff the nostrils?

"After the body was completely dehydrated, the temporary stuffing that was used to fill the body was removed from its cavities and replaced with the permanent stuffing and sometimes also with the viscera packages. Next the abdominal incision was closed, the nostrils were plugged with resin or wax, and the body was anointed with a variety of oils and gum resins, which may have also played some part in preventing or delaying insect attack and in masking the odors of decomposition that would have accompanied the mummification process. However, all of these later stages were essentially cosmetic and had little effect in preserving the tissues."

http://www.touregypt.net/featurestories/mummification.htm

thats bad