Drainage of A Soap Film
If surfactants are well chosen and the atmosphere is controlled (humidity, air movements...) a horizontal soap film can last quite a long time (between minutes and hours). On the contrary, a vertical soap film is affected by gravity and so the liquid tends to drain, causing the soap film to thin at the top. Since the colour depends on the thickness; it accounts for the interference fringes that can be seen at the top of figure 4.
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