Crescent Moon Cold Process Soap Tutorial

Awhile back I took a class at The Nova Studio on how to embed shapes into cold process soap.  I have not tried it yet since I am still getting my barrings on creating a nice bar of cold process soap.  But I saw this really cool embedded soap project from The Soap Queen called Crescent Moon Cold Process Soap.  I was amazed on how a deep black that they got the soap. DId not think they would get it that deep and that it may be alot lighter.  I was thinking that they might have used charcoal or something.  But I am not going to spoil it for you on how they got that rich deep black color.