Edible dust on cakes refers to a type of decoration that is commonly used to add color, shine, and a touch of sparkle to baked goods. It is typically made from a combination of food-grade ingredients, such as powdered sugar, coloring agents, and sometimes even edible glitter. The dust comes in different colors and can be applied using various techniques like dusting it directly onto the cake or mixing it with a clear alcohol solution to create a paint-like consistency.