It is an interference phenomenon of light. When light passes through the film of soap bubbles, the top and bottom of the film will reflect. The soap film can contain about 150 different layers at most. The messy color combination we see is caused by the unbalanced film layer. The thickest film layer reflects red light, the thinnest reflects purple light, and the middle reflects seven-color light, so it will be colorful.

Bubble gun is a very attractive toy for children, which uses air to squeeze bubbles to produce a large number of bubbles in a short time. It is suitable for children and adults over 3 years old.