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As with paper products, security features for plastic cards can include the actual substrate, as well as elements layered on top. For instance, colored core material, invisible inks and those seen only under black lights are used. Fingerprint receptacles, film laminates with holograms and color-shifting inks, and layered silhouettes on photos are also available. "Features can be simple or very, very secure," Jacobs said. The military might use access cards with invisible inks, graphics, laminates and biometric readings, including iris scans and facial recognition.
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