AR uses computer graphics to overlay information on real world objects. The SCARLET project uses AR to link rare books and artifacts in university libraries with related digital materials. This enhances student learning by providing contextual information around physical objects. The project developed an AR application for special collections at The John Rylands Library that was piloted in three undergraduate courses. Evaluation found students found the technology easy to use and video introductions were most valuable. Lessons learned include ensuring content is contextual and closely linked to objects. The toolkit developed is available to help other institutions implement similar projects.