Not that it was ever going to be a commercial success, but scientists in 2013 successfully wrote with ink taken from the fossilized ink sac of a squid from the Jurassic Period, supposedly 150 million years ago.
The ink is still good after all that time? Really? Holy moly.
Either it wasn’t really all that old, or they, like, totally misidentified the fossil, or our understanding of fossilization is all wet. Pick one!