Lump-of-Coal Bath Bomb

Looking for a great stocking stuffer?  Even when you have been bad you deserve to feel good.  This Lump-of-Coal bath bomb fizzes + explodes with skin softening ingredients + the holiday aroma of embers:

Ingredients:  Baking soda, citric acid, corn starch, sodium lauryl sulfoacetate, water, canola oil, shea butter, fir needle essential oil, fragrance, iron (iii) oxide.