Persistence of traces of papillary patterns developed by black Sudan solution on various trace-copying materials

Based on the experiments carried out, the article analyzes the possibility of recopying traces of papillary patterns developed with a solution of black sudan on unpainted magnetic metal, polypropylene, polyethylene terephthalate, glass, enameled metal utensils on such trace copying materials as: gel lifter, fingerprint film on a vinyl base, fingerprint film on an acetate basis of domestic and imported production, depending on the prescription of the formation of traces. In addition, the terms of preservation of the identification features of the papillary pattern in the traces seized on the mentioned trace copy materials were studied depending on the storage temperature of the trace copy materials.