I am making my daughter a Little Mermaid cake I found online. It is an Arial figure in a shell that is placed on what looks like water. The instructions call for airbrushing the icing with certain colors. I do not want to invest in an airbrush as I only bake cakes for my kids birthdays. I prefer to use buttercream frosting and was told by a co-worker who decorates cakes to use a paint brush that is shaped as a fan. My question is, if I used that with food coloring, the brush will just mess up the frosting as it is soft. I thought about putting fondant over the buttercream but don't really like the taste and have never used fondant.
What about coloring piping gel blue then place over your bc??? I have used this several times to resemble water. HTH!