That could be a good point, I suppose. Iron-based ink could have a similar effec... | Hacker News

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		CamperBob2 13 days ago \| parent \| context \| favorite \| on: Poker fraud used X-ray tables, high-tech glasses a... That could be a good point, I suppose. Iron-based ink could have a similar effect. I'll have to see if there's a deck of cards around here to X-ray.

BertoldVdb 13 days ago [–]

We tried this long ago at a university, the cards we had were entirely invisible to the x-ray.

I think the 'x-ray' table in the article works with IR cameras and illuminators under the table, and tablecloth that is slightly IR transparent.

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