while im talking bad fanfic lubes: rosin is only used with bowed string instruments, not plucked ones! it goes on the bow hairs to make them grip the strings better! most importantly, it comes in a SOLID CAKE and is STICKY. it's literally the opposite of lube. and jaskier thewitcher wouldn't be carrying it around anyway, because he plays THE LUTE
https://s3.masto.ai/media_attachments/files/113/826/274/028/898/311/original/a4c596151000cda4.jpg