as for cameras for backside marking playing cards, we have 5 kinds of them.

> infrared camera for backside marking playing cards, it is ordinary camera, its infrared ink marked cards will be able to be seen and checked by other cameras and money machine, even will be seen by UV contact lenses and perspective glasses, but it will depend on the material and quality of cards.

> first generation laser camera, it is one in one camera, and it needs some red laser lights to work with and then can see laser ink marked cards, as for laser ink marked cards, other cameras can not see their marking, UV contact lenses and perspective glasses and money machine also can not check laser ink markings.

> second generation laser camera, it doesn't need any red laser lights to work with. Their laser ink marked cards also can not be seen and can not be checked by other cameras and UV contact lenses and perspective glasses and money machine.

> new ink camera, it is one in one camera, it needs some incandescent light to work with, you will be able to see the markings of cards very clearly. Other cameras and contact lenses and perspective glasses and money machine also can not see and check this new ink marked cards.

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