Soap Making tool to cut this type of edge https://www.wildplantanica.com
This is how I made my cocoa butter and Shea soap with straight lines into three layers and put additional cocoa powder pencil line on top. 
i’m using a slow moving recipe which is 23% coconut oil 15% cocoa butter 10% Shea butter 45% olive oil 7% castor oil my water percent is 27 in the fragrance oil that I’m using I purchased from WSP rice flour and Shea.
What you’ll need is some cocoa powder and three containers that are the same size . You will also need a little mesh screen to sprinkle the cocoa powder on the top to make the pencil lines.
 I cleaned up the bars, using a soap router, which I sell. I will post the link here.  https://www.wildplantanica.com/product-page/soap-router this is an edge cutter that cuts the edge of your soap bars into 20 different designs.
 I stamped my Soap and took a little bit of the scrap pieces, placing them inside the stamp to give it in laid look. 
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