First you'll want to start with soap that's at medium trace.
Too thin, and the layers will all run together, giving you more of a marbling than a swirl.
Too thick and the contrast color won't really drag through.
I scent my soap and then usually set aside about 1/3 or so of my batch for the contrast color.
If you have a plastic squeeze bottle with a pointy spout, like the kind some restaurants use for ketchup and mustard, it'll be easier to drizzle your contrast color evenly and to the edges, especially if you're using a log mold. But a measuring cup with a pour spout and a steady hand will do fine, too.
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