Multi-color thermal images can be obtained by single pass printing and single thermal printhead technique. The systems described in this paper are combinations and modifications of well-established thermal imaging processes. These systems can be used for printing multi-color documents containing text and graphics. Although complete separation of all colors cannot be achieved by this process, successful rendition of a digital image can be obtained by proper selection of the individual components of the system and printing conditions. These systems can also be extended for printing security features by thermal imaging.