I believe that Red isn't really the only color for checking or marking your paper. I remember it is alright to check in any color other than black and blue which are commonly used for answering. We refrain from using the same color used in answering to check the paper since there is a good chance that the owner of the paper would take advantage of the same color ink to cheat(yes it's harsh of them). It's fine by me if they change the color red to something else for checking. Just as long as that checking color is not used for answering the paper.
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