Smashed bottle

Smashed bottle is used during the Rocking Out quest. It is made by smashing an empty ink bottle on a sharp rock, found north of the player's prison cell. The ink bottle must first be emptied by using it on a piece of paper (prison), which also creates inky paper.

Trivia
The empty ink bottle weighs 19 grams, and the smashed bottle weighs 16 grams. This implies that 3 grams of glass were broken off of the bottle.