Suggestion to avoid potential auction house problems and scams:
Powders should list their cost per charge remaining (the way foods break down and show cost per unit). This is especially necessary on the Auction House as some items (like extremely hallowed powder) show an identical icon no matter if there are 5 or 2 charges left (Yet the icons already exist in the art file to differentiate between different charge levels remaining when the item is in one's inventory)..