Welcome to Avatar Answers Wiki! Enter your question below.

As mercury is a liquid, it would be extremely difficult for Toph to feel the impurities within the metal. It might be easier for Toph to solidify the mercury, in order to more effectively bend it. If not, she will still adhere to the traditional earthbending stances, but might be required to alter her arm movements in order to bend the liquid mercury much like how she would bend mud or sand.