Amelia listened to the other students thoughts on what could be in the potion before writing down the ingredients when Lafay told them too.
Once that was done she pulled out her wand and cast "Aguamenti" to fill her cauldron with water. She assumed that there wasn't any dust that she couldn't see in the cauldron, otherwise she would have scourgified it first. Amelia then cast incendio and adjusted it to a low heat, waiting to be told how high it needed to be before she could make a mistake that might not be able to be corrected. That done she looked back up and at Lafay, waiting to see what would be next.