Hello, I have a hand soap that is cracking apart. It is three months old, and sees heavy use. ingredients: 55% Coconut oil 37% Lard 5% Castor oil 3% lanolin 3% tea tree EO as fragrance 2% sugar 2% salt 2% Citric acid + extra lye to offset 1% superfat What causes this kind of cracking, and how do I prevent it? I can see the same thing beginning to happen to the other bar of hand soap I have out. The cracks are purple because the kids washed their hands after watercoloring.