I've only used a tiny bit but I love it.
The charcoal blended nicely into the soap.
The Activated Charcoal incorporated very easily to my cold process soap and the color is beautiful. I did have to use more than a teaspoon to get a nice black color, but it's beautiful and the later is nice and white. It's really super fine as well.
I love the color its true black I had a hard time finding a charcoal true to color without using a large amt.! I'll be buying more soon.