Cocoa butter colouring is sold as a solid. To use it, you must melt it in a boiler or in the microwave. Whatever is easiest for you! Heat the bottle for 10 seconds, shake it, and continue heating for another 10 seconds. Continue until the required amount of cocoa butter has melted. Be careful not to overheat the cocoa butter. Overheating could change the texture, making it impossible to reach expected results or making the cocoa butter unusable.

Using an airbrush?

Heat the tip of the airbrush as needed in order to maintain the liquid state of the cocoa butter so it does not solidify inside.