DATA MEDIUM WITH HALFTONE IMAGE

摘要

FIELD: printing industry. ^ SUBSTANCE: data medium comprises printed fragments of section of a certain tone, besides at least three printed fragments of section have various tones. At the same time one or more of various tones is formed by printed fragments of section visible with naked eye as fully printed, but having a certain share of non-printed white sections. ^ EFFECT: development of data medium having high extent of counterfeit protection. ^ 29 cl, 8 dwg