| 摘要 |
A security device having: a base having a pattern thereon; a mobile component disposed in contact with the base, the mobile component containing a plurality of reversibly adsorbable particles; and a cover attached to the base around the mobile component to maintain the mobile component in contact with the base; wherein the adsorbable particles are mobile and reversibly changeable between a first state where the adsorbable particles are adsorbed to at least a predetermined percentage of the pattern and a second state where the adsorbable particles are adsorbed to less than the predetermined percentage of the pattern.
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