The blue at the top of this post is a Google blue. It’s not the only Google blue, just the Google blue you see the most. How was it chosen? Another blue, a slightly different Google blue, the story goes, was selected by a designer who liked how it looked. But this designer was told by a manager that this blue was the wrong blue: Another blue, testing revealed, had resulted in more clicking. Their boss intervened. 41 blues, between the nice blue and the powerful blue, were tested for efficacy. One prevailed.
By Internet, Why So Blue? - The Awl (via thisistheverge)