BigPatents India

This invention relates development of an inkless fingerprint recording system with colourless ink media. The system for production of inkless fingerprint recording paper, in which suitable colourless reactive ink formulations are prepared, which adheres onto the finger bulds which on pressing on a reactive paper surface, produces coloured impression of the finger bulb, thereby recording the finger print. The colourless reactive ink is prepared in a non-drying solvent medium with certain reactive dye intermediates and other supporting components, which is then kept absorbed in a suitable synthetic sponge with uniform microporosity which does not allow quick drying of the ink because of lesser capillary pressure.