The marks left by this chalk glow briefly as you scribe them, remaining in place to guide you until you choose to erase them.
Wondrous Item 360 gp
A stick of eternal chalk never breaks or wears down with normal use. Any writing or drawing made with this chalk cannot be erased for one week by anyone except the original artist or author.
A stick of eternal chalk can be created in any color.
Published in Adventurer's Vault, page(s) 171, Mordenkainen's Magnificent Emporium, page(s) 83.