Overview
Blue (青, ao) is one of the basic colors. It refers to a color similar to the sky during a well-sunlit day., sea, or lapis lazuli
In English-speaking countries, it was considered a sexual color when pornographic films were called blue films. Now just like other countries, the most popular usage for a sexual color is red and pink.
In pixiv, it is used as a color tone tag.
As a concept, it includes a wide range of colors, and is also a generic term for blue-toned colors such as indigo, pale blue, deep blue, and blue blue blue.
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External Links
English
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青とは (アオとは) [単語記事] - ニコニコ大百科 (NicoNico Encyclopedia)