What is CMYK? Cyan (blue), Magenta (red), Yellow and Black. These are the four colours used in four-colour process printing. lynne broda2017-10-23T09:41:39+00:00 Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInTumblrPinterestVkEmail Leave A Comment Cancel replyYou must be logged in to post a comment. This site uses Akismet to reduce spam. Learn how your comment data is processed.