The Constitution is ink on parchment.

NEWYORKER: The Commandments

Ink and paper (or parchment or papyrus) have functioned brilliantly as a presentation and storage medium for a couple of thousand years.

WSJ: David Gelernter: The Pros and Cons of Cyber-English

The parchment has darkened over the span of 2, 000 years, to a yellow brown, and the ink marks that were once black are graying.

FORBES: Ancient Ten Commandments Manuscript On Display