[Reference] Explanation of Counterfeit preventing device for new bank notes.

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  Hologram (OVD : Optically Variable Device)

  Changing designs by different angles
  By different angles, ‘ map of the Korea’, ‘face value number & Taegeuk (the Great Absolute)’, and ‘Four signs of divination’ can be seen by turns on the thin special film

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  Color Shifting Ink

  Because of special ink, which is mixed with different material having different reflection to the light, the color of face value number changes gold to green.

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  Intaglio latent image

  From the position of eyes, if we look askance at the note, ‘WON’ appears, thanks to a special intaglio printing method.

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  Security Thread

  Held up to the light, the banknote shows microletters within a thin fluorescent plastic film.

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  See-through Register

  If we print out the dividing shape on front and reverse and hold up to the light, the combining shape on front and reverse will make Taegeuk

• Micro Lettering

  Difficult to see with the naked eye, but can be discerned with a magnifier. Itappears as a line or dotted line when forged by color printer or color copier.

  
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  Watermark

  Held up to the light, a hidden reverse image portrait appears in the non-image space on the left side of the obverse, thanks to the variation in thickness within each note.

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  SPAS : Special Press and Soldering

  Without holding the note up to the light, we can easily observe the hidden face value number with the naked eye, thanks to enlarged differences in thickness between parts of each note.

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  Watermark Bar

  Held up to the light, three horizontal dark bars and two bright bars appear in turn, thanks to the variation in thickness within each note.

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  Intaglio Printing

  The special method, putting ink into the concave and print as convex. We can feel granular texture.

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  Fluorescent Security Fiber

  Put the special fluorescent fiber into the note. Using ultraviolet fluorescent light, it is possible to see various scattering fluorescent fiber on the note.

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  Endless Pattern

  A printing method inter-linking the pattern between top and bottom, right and left around the edge of the note.

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  Rainbow Printing

  A printing method whereby colors give a rainbow-like effect.