Using the melt-and-pour method to make soap is a straightforward technique that yields gorgeous results. This idea comes from our friend Kara Whitten. "You can keep the soap as is or cut in half lengthwise and wrap in cellophane to give as gifts," she says.
Cut a 2-by-2-inch piece of clear soap into cubes, each measuring up to 1 inch. Place in measuring cup and microwave on high for 15 to 20 seconds until the soap just starts to bubble. Add in a small sliver of colorant to the melted soap and stir until well combined. Pour into soap mold about 1/2 inch up the sides. Spritz with the rubbing alcohol to remove any air bubbles on the surface of the soap.
Repeat with other colors until you have at least four different colors. Let soap sit for 15 to 30 minutes until hardened.
Separate colored soap rectangles from mold and cut into diagonal slices. Arrange your slices into new striped bars to make sure you have all the pieces cut correctly.
Melt more clear soap in a clean glass measuring cup as above, but this time leave it clear. Pour a small amount of the clear soap into your rectangle mold until just the bottom is covered. Spritz with alcohol and then lay in your colored strips of soap. Be sure to press them down to the bottom of the mold letting the clear soap come up to the top.
Repeat for all the striped bars. Once the clear soap is cool, melt two cups of 1-inch cubed white soap in the microwave until the soap just starts to bubble. If adding a fragrance oil, add a few drops of the oil to the melted white soap.
Spritz the striped soap in the mold with the rubbing alcohol and then pour in the melted white soap to the top. Let harden for one hour then separate from mold.