I was wanting to grate one of my bars to mix with borax and washing soda. However, the only bars I have are ones made with charcoal (it has one layer white soap, layer of charcoal colored, white, then charcoal) and one with moroccan red clay (same layered set up). The charcoal layered one has more coconut oil so I was thinking of using that one, BUT will the charcoal stain the clothes?