Microspectrophotometry, a method for detecting different inks in forging documents

The microspectrophotometry method, combining microscopic and spectroscopic methods, allows researchers to simultaneously record microscopic images and spectral information from micrometer-sized points Microspectrophotometer used in many applications, including color quality control in flat panel displays, thickness control of printed layers in semiconductor integrated circuits, movement of microfluids, study of biomaterials, study of precious stones and works of art. This tool can also be a very powerful method in forensic laboratories to check the matching of colors in forging documents; Because it analyzes spectral information that reflects the chemical composition of the sample easily, at the moment and point, and does not need sample preparation and destroy the document In order to investigate the forgery of documents, in this research, a microspectrophotometer was used to analyze 7 different aqueous automata. The transmission spectra were performed with two different light sources, one in the visible range of 400 to 700 nm and the other in the ultraviolet to infrared range of 300 to 1100 nm. The results show that by selecting the appropriate spectral range, up to 83% of the difference between different inks can be achieved using this device.