Experiments in the workshop: Using black cocoa butter in a scrub bar.

Have you ever used cocoa butter and found it difficult to cut into pieces?  I Found this recipe from Point of Interest Experiment in the workshop series:  Using Black Cocoa Butter that is using black cocoa butter in a scrub bar.  I never heard of black cocoa butter before, have you?  If you have, I would like to hear from you on what you thought if it.