"Permanent ink" refers to a type of ink that is designed to stay on a surface for a long time, without easily fading or washing away. It is long-lasting and not easily removable.
Sentences with «permanent ink»
If you're name is in this book, it is written in permanent ink. (redeeminggod.com)
If you bring toys from home, be sure to mark them with permanent ink with your last name. (bestfriendspetcare.com)
But in many others, they're collecting dust with permanent ink on them. (hechingerreport.org)