Not at all inappropriate! We talk about how bars are made, how people got colors and the like. I haven't found anything that gives as deep a black as activated charcoal, although someone else may have ideas about that. You have to make sure you use enough to get your batter inky oily black to get it this deep and it can sometimes produce slight gray in the lather. The only thing I've seen give such a brilliant and opaque white is TD. Micas seem to lighten the batter but not produce the same stark white. The bars look slightly shiny, which enhances the depth of the black, I think. I know I've read about some people putting a touch of blue or a touch of red with AC to deepen it and enhance it, FYI.
I've gotten almost that dark from Nurture's Black Pearl mica. You can go much darker than with AC and still keep *mostly* white lather.
That reminds me to put some more in my basket for my next Nurture order. I like it sooo much better than AC. It mixes in really easily and doesn't make a mess everywhere.