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Yellow Pages directories are usually published annually and distributed for free to all residences and businesses within a given coverage area. The majority of listings are in plain small black text. Yellow Pages publishers make their profits by selling special value-added features to businesses such as a larger font size for their listing, or an advertisement box next to the listings in a category. Since the mid-1990s, there has been a trend among Yellow Pages publishers to add four-color printing for some advertisements. Many publishers also offer the option to have advertisements appear with a white background to make them stand out more. Interestingly, most yellow pages are not printed on yellow paper; rather the yellow is printed onto the paper. When an advertisement is printed with a white background, its part of the page does not receive yellow ink - so the white is actually the natural color of the paper. This is known as "white knock out".
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