The water may be greyer than grey in one river, and blacker than black in another.

某条河水的颜色可能是死灰色，另外一条河水的颜色可能是漆黑色。

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To gain attention, headlines had to be ever bigger, blacker and more terse.

ECONOMIST: Behind the headlines

Kindle Paperwhite's screen has 25% higher contrast - the blacks are blacker, and the whites are whiter.

ENGADGET: Amazon announces $119 Kindle Paperwhite with illuminated, capacitive touch display

Kindle Paperwhite's screen has 25% higher contrast than the previous generation Kindle- the blacks are blacker, and the whites are whiter.

ENGADGET: Amazon's new Kindles now available in Canada, Paperwhite starting at CAD $139