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7 points

Unfortunately there are techniques that work with black and white printers too. I don’t know if any have actually been implemented though.

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5 points

I hadn’t heard that. I guess imperceptible grey is just as good.

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4 points

I can’t find it now but IIRC it works differently - not by adding dots but by subtly modulation the laser power. It’s more like traditional steganography.

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