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PLEASE READ THIS IF YOU WANT TO KNOW HOW TO MAKE THE CAKE RAINBOW
Firstly, you just mix up the batter like you normally would. Any cake batter will do, but a white/vanilla cake works the best. Next, seperate the batter into different bowls for each colour((Aka one colour would have it's own bowl)). Next, place the colours into the pan, the colour you want on the outside ring should be put in first, then the next colour and so on and so forth.
Have fun making your cake!
------ So , and I made a double rainbow cake.
I'm pretty proud of it if I do say so myself.
The first layer was perfect, though the bottom stuck to the pan a bit. The second layer's bottom half completely ripped off and later split into quarters from it's weight. The third one's bottom came off a bit, but it was good enough to glue back together with icing.
All in all, about 3-4 hours works spread over one evening and half a morning.