One of the first things investigators look for at the scene of a crime is prints. They hope to find fingerprints on items in the house, footprints in the soil outside the house and even tire prints. Fingerprints are one of the most effective methods of identification. However lip prints can also provide important information. At the present time more and more people use protecting lipsticks and permanent lipsticks. Also male suspects leave lip prints at the crime site which are crucial evidence in crime scene investigation. When these latent prints are generated by contact with a surface and, like with the latent fingerprints occur, this latent lip print can be developed by various methods. Though there are several methods to identify latent finger prints but not many techniques are explored in case of latent lip print. The present article aims to review the various techniques used to develop latent lip prints and the newer arenas yet to be explored. 

Keywords: Latent lip print; Ninhydrin and analogues.