So when is it OK to use red ink? According to Emily Post The Etiquette Daily, “red ink should be used for corrections and editing, while blue or black ink is generally used for handwritten communications.” So if you’re a teacher, an editor, a writer or a student and you’re trying to edit any written work (and therefore track your changes) then red ink is totally OK. In any other scenario, avoid red ink, which has a tendency to seem aggressive. In fact, last year one school in the UK banned teachers from using red ink because it was a “very negative color,” and the fear that student cannot handle that intense criticism.
