"I need a Death Eater. One they think is dead." Hermione picked up a glass jar and spoon, scooping up enough to fill the jar. "Take this, and go to see Charlie. I want you to put this on a Dark Mark, about a centimetre thick and then wash it all off with this." She pulled out a wooden box, opening it to reveal two lines of vials, all containing thick, yellowish-green goo. "Bubotuber pus. Wear gloves." 