Why tennis balls are yellow -- or maybe green

edition.cnn.com

What color is a tennis ball? Is it yellow? Is it green? Really think. It turns out it depends on the person looking at it, much like the color of the dress saga from a few years ago. But get this: tennis balls didn't get their distinctive neon hue until nearly a century after the game was invented.

After many iterations, including balls made of cork, wool and even human hair, the tennis ball found what was then its ideal form: a ball made of a rubber core encased in white or black melton, a tightly woven and felted fabric.
For nearly a century, tennis balls were white or black. It wasn't until 1972 that tennis balls took on their bright neon hue.

The reason for the change? Television. Once the sport started being televised, the white balls were hard to track. So the change to green. Or is it yellow?

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