Cut the soap base into 8 - 1 inch cubes.
Add 5 cubes to the measuring cup, and heat on high in 30 second intervals, until melted - stir well between each heating session.
Add 6 drops of each fragrance oil, then stir in the orange mica. Stir well, until the color is solid. Pour into two of the jack o lantern mold cavities. Spray with rubbing alcohol if desired to reduce bubbles.
Add the remaining 3 cubes to the measuring cup, and heat on high in 30 second intervals, until melted - stir well between each heating session.
Add 3 drops of each fragrance oil, then stir in the purple mica. Stir well, until the color is solid. Pour into one of the jack o lantern mold cavities. Spray with rubbing alcohol if desired to reduce bubbles.
Allow soap to set for 2 hours before unmolding.