u201c back u201d side of the fabric e g on the opposite side of a fabric comprising a decorative pattern intended to be viewed on the front side of the fabric in some embodiments the surface carrying the markings becomes the inside surface of a finished product e g so that the markings cannot be seen in the finished product in some embodiments any markings on a finished product which remain visible to the naked eye are rendered invisible to the naked eye in some embodiments the markings of the procedure map are visible to the naked eye and can therefore also be detected by a suitable machine in other embodiments the markings are not visible to the naked eye but can be detected by a suitable machine the markings can for example be visible to the naked eye under ultraviolet light in some embodiments the fabric is produced e g by weaving and the markings are imparted to the fabric in a single continuous operation alternatively the markings can be imparted to an existing fabric e g a woven fabric in a separate operation in either case an automated dye and marking system can optionally be used preferably the result of the process is a roll of fabric having the markings throughout the length of the fabric on the roll in one embodiment straight of grain markings are introduced during production of a woven fabric by including warp and.