When reviewing documents posted to a web page it may be helpful to reset the links that have already been clicked and gone from blue to purple / black. During a second pass through the documents, it's helpful to be able to check them off one by one again.
Use Chris Pederick's Web Developer app for Chrome in order to reset the links without the bother of clearing your browsing history. It can be added here. A cogwheel icon will appear on the top task bar.
Click on the Miscellaneous section and select, 'Mark All Links Unvisited'. This add-in for chrome also includes a number of other useful tools