Glue

A new adhesive
''Animal butchery and fisheries produces many leftovers which have no use. Some propose to experiment what we could do with some of them: tanners noticed that by boiling skins it sometimes produces a sticky jelly that hardens when it cools off. A furniture maker wants to experiment on this idea to see if this could be used as an adhesive substance strong enough to hold pieces of wood together, which could greatly improve the quality and production of fine furnitures.''

Potential Requirements

 * At least 2 furniture makers
 * Produce and sell 4+ furniture (likely)