Hopping off her stool, Ashley wandlessly summoned a small knife to her hand as she approached the cauldron. She cut a small wound along her forefinger and hovered it above the cauldron, moving it only when precisely three drops of blood had been added to the potion. The blood stained the white liquid until it eventually faded as if it hadn’t been there in the first place. Snape then stepped forward and secured a small portion of the Elixir in a small, clear flask, sealing it off with a cork.