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Couldn't the cards have x-ray opaque ink (like with bismuth trioxide)?
by sigmar 1y ago
Couldn't the cards have x-ray opaque ink (like with bismuth trioxide)?
- CamperBob2 1y agoThat 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 1y agoWe 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.