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A very simple soap bubble juice made with guar gum as the main enhancing ingredient has widely proven its capabilities for making nice giant bubbles. It is especially also good when there is lower humidity!
For more details and in-depth information see http://soapbubble.wikia.com
This video is especially meant to give you an idea about how fast and easy a bubble juice with guar gum is mixed. You normally don't need any mixing device but just stir everything by hand using a spoon, a whisk or similar!
I used a magnetic stirrer to be able to better show how fast the guar hydrates.
Having a closer look at the initial mixing phase you'll notice that it starts with a nice vortex that very soon disappears - the guar already had hydrated to a great extent but will finalize during the whole process.
The mix is made of:
4 liter water (the first liter warm from the tap, the rest cold)
160 ml dish-washing detergent (40 ml per liter of water; I used the German Fairy)
6 grams guar gum (1.5 gram per liter of water)
4 grams baking soda (1 gram per liter of water)
2 grams citric acid (0.5 gram per liter of water)
Instead of the baking soda and citric acid you also might just use
baking powder (around 2 grams per liter of water)
All measures are uncritical and you easily can experiment with the amount of guar in a range between 1 gram to 2.5 grams per liter of water.