Blue Dragon Scale Dust

Ground from blue dragon scales. Integral to making antifire potions.

Blue dragon dust is one of those things where you wonder who invented it, and what curious sequence of events led to it happening. Some unknown person had the wherewithal to strip a dragon of dragon scales, crush those scales in a pestle and mortar, then apply the resulting dust to a potion. Not only that, they downed said potion and stood in the path of a dragon. Does that not seem inexorably mad to you? 

But thank you, inexorably mad person, because now we have this potent ingredient which