Optically variable identification element FEEL-ID

A composite security feature based on colour changing and thermochromic effect. It was developed by Giesecke&Devrient company. FEEL-ID has a multilayer structure: 1) The top layer is made using STEP security feature with liquid crystal pigments; 2) The middle layer is made of thermochromic ink; 3) The bottom layer contains laser-engraved identification information (holder's portrait, etc.).

FEEL-ID characteristic features:

  • its colour changes at different angles of observation and illumination (colour changing effect, STEP element);
  • identification information hidden beneath the thermochromic ink layer is revealed when exposed heat (thermochromic effect).

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