Hii! How do i make a rainbow for my st pattys cake?? and without using fondant.. any ideas?! thanks =)
Can you do a gel paste transfer? We learned that in Course 1 classes.
You could use a FBCT, or Royal Icing, I made a St. Pattys day cake this past week, and I used Marshmallow Flow. Add some icing color to it then just heat it in the microwave for about 30 seconds, put into a piping bag and use just like icing. It flows pretty good, you need to use a royal icing as your lines for the design to keep it all in a good shape. It was really fun, and my kids really liked it. 
Dang... I just colored some buttercream and using a star tip, piped on a zigzag rainbow... 
If you are talking about a free standing rainbow, I would think color flow...
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