depleted uranium

Michael frowned down at my hands. "You know, I never really thought to ask before - but what is that dust made of?"
"Depleted uranium," I told him. "At least, that's the base ingredient. I had to add in a lot of other things. Cold iron, basil, dung from a - "
"Never mind," he said. "I don't want to know." He turned away from me, his arms steadily holding the massive sword before him. I recovered staff and rod, and stood beside him, studying the lay of the as-it-were land.


Grave Peril Chapter 5, Page 39