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How to swirl multiple frostings for cupcakes
Push your frosting tip into your piping bag.
The type of tip you choose will change the style of the frosting. For example, a wilton 2d closed star tip creates a ruffled appearance in the frosting.
Whereas a wilton 1 m open star tip will give you a smoother look. However, the choice is up to you! You can also use a coupler, which allows you to change out the frosting tip without having to use a new piping bag.