I've had customers send in pictures a couple times of a cake that has a six-colour rainbow swirl- as in 6 icing colours piped together. I've done this before with a maximum of 3 colours, using 3 piping bags inside one larger one, and even that can be a pain (with only 2 colours coming out half the time or the colours mixing together, having to waste a lot of icing in the process), so I cannot fathom how someone does it with six colours! I can't find anything online where anyone has used more than 3 colours. Has anyone tried tis with any success??
Make sure its firm BC, pipe long lines next to each other on plastic wrap, roll it up and put that whole roll in a piping bag - you can do it!!!!!
I used five colors for autumn leaves and for piping the inscription — i would bag up all the colors in their own piping bag — then take a separate empty bag (parchment paper — but plastic would work) and using an opening in the bags of colored icing about the size of an open coupler — i would grab the first color and start piping inside the empty bag in a straight line from down into the empty bag — about three inches from the tip to halfway up the inside of the bag — I would keep the pressure light to begin and press harder going up so the icing stream got heavier/thicker going up — narrow starting out — the first piping trail runs along the seam of the bag — and the ones to follow use an ‘imaginary ‘ seam — so the bag is striped like the top of a circus tent — I repeated these steps for the other three colors — striping them up the inside of the bag —
then you put a big large blob of the main color in the middle — I used the lightest color — because the striped colors are running up the inside of the bag and the big blob is the carrier to run them out through the tip when you squeeze —
while the striped colors attach to the sides of the bag — they can be placed equidistant to each other all the way around it — or in my case I placed them more on one half of the bag because I was doing leaves and you would only see one side of the leaf and I wanted all the colors visible — so if you use a piping tube in the bag — you can adjust it aka twist it to the best colorful advantage
so that’s how I would do that