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This is awesome, this guy just DIY'd Project Long Now (ah further reading makes think it's part of Long Now)
Pretty cool. Having visited salt mines in that part of Germany I think it is an amazing good place for the project, I really hope it survives changes in ownership if they occur.

I also like the idea of putting this stuff on fired clay tablets. I saw some tiles that had been laser etched (more as a home decor idea rather than an archival mechanism) and the clarity was spectacular. What I don't know is if folks have done the 'what this would like like in a thousand years' sort of aging/testing on them. It seems from the home decor tiles that the laser etching was not very deep so fairly simpler erosion would remove it. (unlike cuniform which is pressed a couple of mm deep into the clay before firing)