Security: Are PrintCoins X-ray proof?

[Pygy]

I remember that when I was young that a storekeeper and a veterinary were arrested because they were reading the unsold scratchable lottery tickets of the former with the X-ray machine of the latter. They kept winner tickets for themselves, and the the rest to the unsuspecting clients of the shop.

Are you sure that the PrintCoin seal is also opaque in non-visible wave lengths? Or that the black ink isn't more opaque than the seal? It's all about contrast.

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[Meatpile]

Physical bitcoins in their current form are entirely broken (bitbills, casacius bitcoins etc) because you could never trust them

For a physical bitcoin to be trustworthy (meaning blind anonymous acceptance upon offer)  it would need to cost more to make the thing than its worth when counterfeiting it...  Which leaves no profit for anyone producing such a thing

The only way to trust offline transactions are through a trusted third party / encrypted escrow hardware that holds funds for a full 24 hours  for instance