Abstract: The invention relates to read/write methods for information hidden from visual perception and can be used to visualize hidden images of identification of an object, which provide protection against unauthorized reproduction. The surface of the object is first polished. An optically invisible marking image is formed on the polished surface by modifying at least one area of the surface, which changes the surface energy of modified sites. Said marking image is visualized by establishing a meta-stable environment in the vicinity of the aforementioned surface of the object. The marking image is produced in the form of distinguished structures formed by stable phase particles of the meta-stable environment at the sites of the object surface having different surface energy. Prior to performing a visualization process of the optically invisible marking image, the surface containing the modified areas is electrically-charged and cleaned by friction.

Abstract: This invention relates to methods of writing and reading information hidden from visual observation and may be used for visualizing hidden images (marks) identifying an object, which provide protection from unauthorized reproduction (forgery). The method of creation and visualization of an optically invisible mark consists in the following. On the surface of the object in question an optically invisible marking image is formed by means of modification of, at least one part of said surface, after which visualization of said image is established. Prior to formation of the optically invisible marking image the surface of the object in question (carrying the applied image) is made into a mirror. Modification is achieved by changing the surface energy of the parts being modified.