In general, most Japanese manga are not colored, except for title page or centre color pages, rarely. However, most Korean manhwa manage to colour their works while maintaining a good standard of art, also in their weekly deadlines.
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[related post: why do manwha more oftenly have colored pages then manga](http://anime.stackexchange.com/a/7417/1458) & [Why are manga black and white?](http://anime.stackexchange.com/a/4286/1458) if not duplicate – Dimitri mx Mar 04 '16 at 11:37