How to create a Rainbow Ombre Buttercream Finish

Starting with a chilled crumb coated cake; pipe rings of buttercream around the cake starting with the darkest colour at the base of the cake. We chose to create a rainbow ombre so started with the violet shade. 

Pipe the other colours buttercream up the side of the cake and pipe your top colour on the top of your cake as well. 

Use a palette knife to smooth the top of the cake. Then using a cake scraper to smooth the sides of the cake, fill in any gaps with buttercream and continue to smooth the buttercream until you have a smooth ombre buttercream cake!