Cut your soap into 1-inch cubes, and place it into the measuring cup.
Heat on high for 30 seconds, remove and stir well. Heat in additional 30-second intervals, stirring between each heat session until soap is fully melted, and there are no clumps.
Add mica to a small dish and add just a little bit of rubbing alcohol to it. Stir until color is combined.
Add color to the soap base, stir until the color is solid.
Pour a small amount of soap into each mold cavity.
Place a shark into each mold cavity.
Fill the rest of each mold cavity with the remaining soap base.
If you have bubbles, you may spray with rubbing alcohol.
Allow soap to set for about 2 hours.