I nod and he walks away, as I look around I see Ron watching me. A deep frown on his face. Annoyed, I roll my eyes, wipe the sweat from my forehead with my sleeve and focus back on the potion. Why is the potion black? It should be a pearly white. As I throw in the last ingredient it starts to bubble and steam. That should not be happening. Before I can reverse the reaction, it explodes, creating black smoke that hits me in the face. "For fucks sake!" I snarl loudly, the potion is dripping from my face. "Scourify," I snap as I grab my wand and wave it over my face and clothes. 