Things You'll Need:
- Balloons in different colors
- Helium tank
- Large, sharp needle and strong yarn
- Heavy things to tie the balloons to
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Step 1
Buy your balloons and helium. To make a rainbow balloon arch, you'll need balloons of many different colors. You want the balloons to be as fresh as possible and you'll need quite a few, so your best bet is to get a tank of helium and fill the balloons yourself. This way you can also decide as you go how many balloons you will need in each color.
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Step 2
Tie a very long piece of yarn securely to a heavy anchor item like a rock or very thick book, or a stable location like a railing. Thread the other end of the yarn onto the needle.
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Step 3
Thread this yarn onto the needle and begin adding balloons. Poke through the extra bit of balloon outside the knot, and push the balloon all the way to the other end of the yarn. Keep adding balloons, gently pushing them tight after each addition. To make a rainbow balloon arch, add balloons in rainbow order.
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Step 4
Check the length of your chain occasionally by holding the unfinished end near the ground and to see the height of the arch. Add balloons until you are satisfied with the size of the arch.
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Step 5
Securely attach the unfinished end of the yarn to your second anchor item. The buoyancy of the balloons should pull them up into an arch shape naturally.









