Along the lines of the Hotdog/Sandwich thread, I bring you "What color is a tennis ball"
From a CNN article:
The unmistakable shade of the tennis ball is officially called "optic yellow" by the ITF. But a Google search for "optic yellow color" leads to the online color encyclopedia ColorHexa. There, the shade is listed as #ccff00 and marked as "Fluorescent yellow or Electric lime."
Counter argument. Just because someone calls something yellow doesn't mean it is yellow.
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So old-school. Most tennis courts today are blue.I chose yellow. Never seen a yellow tennis court . Most court are green.