How do you make red icing darker when out of food coloring?

To make red icing darker without food coloring, you can mix in cocoa powder or Dark Chocolate. Start with a small amount, as it can alter the flavor and consistency, and blend it in thoroughly. Alternatively, you can add more powdered sugar to create a deeper shade while maintaining a smooth texture. Lastly, consider adding a bit of black icing if available, as it can enhance the darkness of the red.