Aurora put on her gloves, scourgifying them just in case, and took three leaves. One of these she placed into her (newly scourgifyed) mortar and used her pestle to crush it. AHA! The acid seeped from the leaf. When there were three drops worth she used her dropper to place them into the cauldron and stir it three times anti-clockwise. She then cleaned the mortar, pestle and dropped and placed them on her work station - always stay ahead of the cleaning.