Why is it that no matter what color bubble bath you use the bubbles are always white?

为什么不管你用什么颜色的泡泡沐浴液，冒出来的泡泡都是白色的？

youdao

Bleached by high water temperatures, this bubble-tipped anemone is largely devoid of the algae that provide color as well as energy from photosynthesis.

由于水温较高，奶嘴海葵变得发白，这是由于缺乏海藻，海葵的颜色来自于海藻，另外，海藻的光合作用给海葵提供能量。

youdao

Bubble is really beautiful ah! Some like the color of the ball, and some like the red sun, as there is a white circle of the moon.

泡泡可真漂亮呀！有的像彩色的皮球，有的像红红的太阳，还有的像白白的圆月亮。

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Employee John Spragg recounts the story of one customer who wanted the color of his Bentley to match a bubble-gum wrapper he had saved.

FORBES: Magazine Article

When it comes time to fill in the bubble, they're not quite as ready to be as color-blinded they might think that they are.

NPR: Examining New Hampshire's Surprise Shift to Clinton

Thought bubbles (picture the dialog bubble above the head of a comic strip character) are the unspoken attitudes, assumptions and beliefs that color our view of the world.

FORBES: It's Time For Our Leaders to Start Acting Like Leaders, Part II