What was the substance used to stuff the mummies's nosterals?

Since this is not my area of expertise, I searched Google under the key words "making mummies nostril" to get this source:

http://library.thinkquest.org/J002046F/mummies.htm

Use the <Find> command to locate the last key word.

I hope this helps. Thanks for asking.

what is stuffed into amummies nostril

Sorry, no not really...