The easiest thing to do would be to get a detailing tool. BB has one, and you can also find them in cake decorating aisles at craft stores. I have a turkey injector that works nicely. You would melt down the soap, color it, fragrance it, put it into the syringe, and then carefully place the soap where you want it. Let it cool/harden for a few, spritz with alcohol and then pour the rest of your soap.
You have to work kinda quickly because the soap will cool quickly. I like to warm the syringe for a few secs in the microwave to try to prevent the soap from cooling too fast.
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