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Infrared bar coded cards

For better security than the usual bar code Infrared Bar code cards can be used. Infrared cards contain a series of bar codes, similar to standard bar code cards, but the code is only visible when exposed to special infrared light. Infrared bar coded cards are reasonably priced, very reliable, not easily duplicated, and offer a good level of security. However, these are also not much in vogue.

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