I haven't quite come across any good solid search results as to what you mix colorants with to put into MP soap. My first time doing MP, i just put straight powder into the soap, and it dissolved and dispersed very easily.. I wasn't so lucky the next time because I ended up with little bits that clumped, although they were evenly spread out so they ended up almost looking like sparkles put there on purpose. After sitting for a couple days, it looked like those spots began to kind of disperse in the soap, as they got lighter in color and wider. I remelted the soaps thinking the last bits of powder would finally work they way in, but they didn't. Even a stick blender couldn't save me. Last night I tried mixing the powder in with a little bit of castor oil, then putting it into the soap and that worked quite well, but I was extremely worried I'd end up with an oily feeling soap, so I only used a small amount, and that resulted in me only achieving half the darkness of color I wanted. Any suggestions?