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Why Bubbles Have
So Much Color
Similar to the way we perceive the colors in a rainbow or an oil slick, we see the colors in a bubble through the reflection and the refractionof light waves off the inner and outer surfaces of the bubble wall. You really can't color a bubble since its wall is only a few millionths of an inch thick, but a bubble reflects plenty of color from its surroundings.
The longer a bubble "lives," the more gravity has a chance to pull the fluid in the bubble towards its bottom. As this happens, or as water evaporates from a bubble, it loses its color..... first at the top and then all over. You can usually tell that a bubble is about to pop when it becomes colorless.
Frozen bubbles really have no color! By putting dry ice in a plexiglass box and blowing bubbles into it, the bubbles, as they filled with CO2, sank to the bottom and actually froze. You might try to make a bubble outside in the wintertime. Let it freeze on a wand to get the same effect.
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