Burnisher Etching Tool

(C) The burnisher is a smooth sided tool with a curved tip used in etching techniques. The curved tip allows one to focus its polishing action into a smaller area as it is used further toward its tip.  
Application : Pressure is applied as the burnisher is rubbed on the plate. The smooth steel is harder than the zinc plate and this rubbing action softens surface textures.  
Description : The burnisher is also the tool used by mezzotint artists to smooth the texture of the mezzotint plate.