[adrian_b]

The stone or ceramic tablets are fragile, so they can break.

Bronze tablets will not break. Unlike stone or ceramic, they are slowly corroded, but we have well preserved bronze tablets which have survived at least 2200 years.

A bronze tablet, or better a stainless steel sheet, can be engraved with text using a computer-controlled mill.

[jhgb]

Wouldn't corrosion be easily prevented using electroplating? A gilded surface would have significant longevity on top of any metal.

[bashmelek]

If money is no object, where does, say, platinum-iridium stand on this?