Frozen - again

Again I tried to blip a frozen soap bubble.
I used: the morning light, a light box against the wind (much less windy today), different soaps, water, gloves ( It was -6°C). and a plant to prevent the shaking of the cold hands. It was a real challenge for my patience to get the bubbles onto the plant without a burst. :-S
I have no idea what mixture they use in this commercial. 
If anyone has a good tip I would be very grateful :-D
I tried to add some water to the soap, but the bubbles became less stable. And I struggle with the visibility of the ice cristals...
Tomorrow Birgit and Bert will visit us. I really look forward to them.
But I'll have no time for more soap bubble experiments....