In a small pot add the cocoa butter just until melted. Take off the heat.
In a small container add the baking soda, citric acid, melted cocoa butter the mica, blueberry powder and arrowroot powder and stir well until you get a thick buttery consistency. If it seems too thick, add a little more liquid cocoa butter.
Roll into 3 or 4 balls or use a small mold. When the balls are hard enough, roll in flower petals, (same as making chocolate balls rolled in nuts). Place in a freezer to quicken the hardening time.
Use in your tub for a great fizzy, moisturizing experience.