A document, in particular a credit instrument able to reveal forgeries

摘要: To prevent the forgery of a document such as bank cheque, or personal credit instrument in general, perpetrated by photocopying doctoring original printed data any way, support (1) is coated on one both faces with layer (3) microencapsulated dye protected at least outside film transparent lacquer (6), that attempt to write produces an indelible mark visible from sides; unauthorized prevented applying metallized strip (7) reflective surface document, which causes opaque, darkened area appear photostatic reproduction, immediately distinguishing copy original. Documents might be produced microencapsulation only, according whether main threat falsification reproduction.