This English book is subtitled "The Art of Blowing Bubbles" and that is exactly what it contains.
The book is for you who want to get wiser on soap bubbles and learn all the great and fascinating tricks. From the content list we can e.g. mention:
Bubble Formulas
Homemade Bubble Wands
Giant Bubbles
Bubbles Inside Bubbles
Bouncing Bubbles
Splitting Bubbles
Joining two Bubbles
Carousel
Garland
Bubble Domes
Bubbles Streaming Smoke
Bubble Inside a Bubble Inside a Bubble
Bubble Juggling
Performing with Bubbles
Super exciting and useful reading, which of course also contains a good recipe for balloon fluid.
Bonge is both if you want to act professionally with soap bubbles, but of course also if you just want to try it for fun.
If you see what is possible to do with soap bubbles, click on the you-tube link to the great video from Kuma Films.