From iParadigms:
Turnitin recently added the ability to add coloured highlights with comments to student papers in GradeMark. Instead of only a plain yellow highlighter, you can now choose from five colours—blue, green, yellow, pink, and purple
After you highlight a passage, click on the highlight to add a comment bubble, or click on a QuickMark comment in the sidebar to associate the QuickMark to the highlight.
One great way to use these various highlights is to colour-code your feedback—for example, blue may be constructive feedback, green can be positive reinforcement, yellow can be comments on composition, pink may be comments on format, and purple can be comments on grammar.
