Permanent ink

Super useful, but super bad in the wrong person's hands... Like a child, or a person with a super bad type of humour

Yes, the name indicates that the ink is permanent, and therefore irreversible damage can be done in some unfortunate circumstances - though permanent might not be the exact right word for it. It is true that it's really difficult to remove once it's applied, but not impossible per see.
The creator of this incredible ink has a way to remove it, though it is difficult and only they know how it is done. The ink wasn't made for any ordinary person living in Aewyn, but rather for the people needing some kind of safety for the records they are keeping, important contracts and other documents that you wouldn't want to lose.

How does it work though?

Hah! Well, wouldn't you like to know? It's made from some kind of magic, and that is almost as much as the average Aewynian knows about this technology. The person behind the ink isn't willing to share - because of obvious reasons.
The only of its kind on the market! And both the governments, museums, heck! even the damn presidents buy the permanent ink! It's a good business that's for sure. They magically produce the ink themselves, and most are made upon ordering a batch to make sure there aren't too many on the market people could potentially get their hands on.

Incidents

Some citizens have gotten their hands on this magical ink and have had their fun with it. Some reports of crudely drawn moustaches on peoples faces, graffiti on buildings, mostly penises, or a simple "___ was here".. I know, we humans are super original.
Being the only person that is able to remove it again, they are kinda busy around festival times where people are having extra fun in the streets. But it's better to be busy than to risk someone being able to magically wipe entire records at Aewyns Cultural Heritage Preservation headquarters.

Well shit... This does not come off!

As cool as this ink is, and as useful it has become in many situations, the creation of it wasn't intentional. Magic can be a tough thing to tame, even for a master, and sometimes you're just lucky you end up with permanent ink instead of an explosion blowing of your roof.

Details

Creator and inventor

Tekatii Ruvir, a master of magics in Ywaryn, and a magics and history researcher at Aewyns Cultural Heritage Preservation.

Usages

Preservation of important texts (and for graffiti and fun times in some cases)

Order time

Usually, Tekatii makes the ink per request, so they don't have a large stock for thieves to potentially rob. The order time is rather quick and can be up to 2 days.

Order size

Each glass bottle contains around 50 grams of ink.

Experimentations

Some have tried using the ink to make non-painful tattoos, and it seems to have been a success, as the ink is near to impossible to get off the skin as well! Who knows, there might be a tattoo edition for sale at some point?