Hi there. What I do is take white food coloring and a toothpick. I run that thru the caps you make with your blue frosting or piping gel. I've seen others use white frosting probably from a tip 2 or 3 but I've used the toothpick method and works great. good luck!!
i did white caps on my dolphin cake and i mixed my crusting buttercream with some royal icing. mixed it together and set dabs on the top then took small angled spatula and pushed forward then lifted and curled it back took a couple trys but it works
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