Just sharing that I’ve had success writing on blanks with these lately, and it’s a low maintenance process.
Recommended by my local artist supply store for writing permanently on hard, non-porous surfaces and they come in (at least) black, White, silver, and gold.
They dry to the touch without smearing very quickly, but will still wipe off with mineral spirits (at least for a while!). I’ve been putting a coat of CP over the writing before finishing, but honestly I’m not sure you’d need to.
Results have been good, my godawful chicken scratch handwriting notwithstanding.