A printed image (usually repeated words, numbers of texts) 0,15–0,3 mm high. It is visible only with magnifying devices; can be perceived with the naked eye as a thin continuous line.


  • Positive microprinting consists of dark letters on a light background (fig. 1, a);
  • Negative microprinting consists of light letters on a dark background(fig. 1, b);
  • Reversed (turned out) microprinting changes gradually from negative to positive and vise versa. (fig. 1, c).

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