Glycerin soap base is often sold in clear blocks, even if it's a honey-glycerin base which is clear-yellow in appearance. When you want a solid, opaque bar of soap you can use glycerin soap and customize it to fit your needs. Knowing how to make glycerin soap opaque isn't difficult, and only requires a few extra ingredients. This gives you the opportunity to create attractive body cleansing products.
Put the glycerin melt and pour base in the glass bowl. Microwave the bowl on high for three minutes, or until the base is melted into a liquid state.
Stir in the titanium dioxide. Titanium dioxide is a natural mineral pigment that turns beauty formulations creamy, opaque-white in appearance. Stir thoroughly.
Add the optional colorant. You can either use a food coloring of your choice or a mica mineral pigment. Mineral mica can be purchased from craft and hobby supply stores with the rest of your soap making materials.
Pour the melted soap into an 8 oz. soap mold or two 4 oz. soap molds. Place the mold in the freezer for 45 minutes.