Parchment? Whats it for?

I have seen parchment on many of the artisans, but I have yet to figure out what its for.. Someone told me crafting, but what on Tyria would you craft with parchment?

Thanks for answering my very noobish question.

tatoos
edit
as in monk armor

So only monks can get tattoos?

I think it's also used to craft Necro scar patterns.

It's also a quest item for the quest unlocked by completing Cities of Ascalon.