Chop the melt and pour soap base into small pieces. Melt it in a double boiler, then remove from heat and stir in the fragrance oil and essential oil.
Split the melted soap base into two pitchers and stir in the mica powder. Make each pitcher a different color.
Pour the soap base into the silicone molds, alternating between colors to give it a layered look.
Allow the soap bars to harden completely before removing them from the molds.
Notes
Melt and pour soap base can take a long time to melt down. The smaller you chop it up, the faster it will melt.
Work quickly! The soap will begin to harden rather quickly, so it's important to get it into the molds as fast as you can.
Rather than a double boiler, you can melt the soap base in a glass bowl set atop a pot of boiling water.
This recipe will make about 12 bars of soap, depending on the size of your molds.
If you're giving the soap as a gift, I like to add a piece of hemp twine and a gift tag or dried orange slice before gifting. You can also put it in a paper bag or small box. Packaging your gift beautifully adds that extra special touch!