Violet was not looking forward to working with troll dung, with or without a mask, so she quickly got to work on the potion to take her mind off it. "Scourgify!" she cast matter of factly--she'd done it so many times by now, it was almost second nature. Carefully she half filled her cauldron with the milk (was that exactly halfway? should she measure it? or was she obsessing over it now?) Deciding that she definitely was obsessing, Violet moved on and deftly cast an Incendio to create a low fire.

Still trying not to think about troll dung, she methodically cracked each doxy egg exactly in the middle and stirred the cauldron one counter-clockwise stir...