I saw this on Pinterest and I just had to try it. Going so far to decide to make cupcakes JUST to try out rainbow swirl frosting. LOL. I liked the way it worked and it’s definitely useful for a wide range of yearly celebrations. I do, however, need to make sure I make the butter cream cooler before piping… lol. It was way to melty and warm for it to look nice. At least I learnt it is actually possible!!