Anticounterfeiting currency is one application.
You take a piece of rock with fine detail on it. Fossilised chalk or diatomite or such. Gild it using gold/mercury for a conductive surface. Electroplate a hard metal like tungsten or chrome on it. (electrowinning most transition metals is easy) Dissolve the rock using vinegar or lye, and poof, you have a paper printing image that isn't going to wear out any time soon.
You take a piece of rock with fine detail on it. Fossilised chalk or diatomite or such. Gild it using gold/mercury for a conductive surface. Electroplate a hard metal like tungsten or chrome on it. (electrowinning most transition metals is easy) Dissolve the rock using vinegar or lye, and poof, you have a paper printing image that isn't going to wear out any time soon.