This normal-seeming dust is actually a highly magical powder which can be used to conceal the passage of its possessor and his or her compatriots. 

Tossing a pinch of this dust into the air will cause a chamber of up to 1,000 square feet in area to become as dusty, dirty, and cobweb-laden as if it had been abandoned and disused for a decade. 

A pinch of dust sprinkled along a trail will cause evidence of the passage of as many as a dozen men and horses to be obliterated for a mile back into the distance. 

No magical radiation will occur from the use of this dust. 

The substance is typically found in a finely sewn pouch in which 13-24 pinches will be contained.