karhennuksessa
Karhennus is a surface treatment used in metalworking, leathercraft and woodworking to roughen or texture a surface. The aim can be functional, such as improving adhesion of subsequent finishes, coatings, paints, or patinas, or decorative, producing matte, stippled, or patterned textures. The term derives from the Finnish word karhea, meaning rough, with the -nus suffix indicating a process.
Techniques vary by material. In metalworking, karhennus may involve hammering with textured faces, punching, or abrading
Applications include preparing a surface for painting or plating, creating tactile features on tools or jewelry,
Safety and quality considerations include using appropriate personal protective equipment, achieving consistent texture, and avoiding over-roughening.
See also: surface finishing, texturing, patination, engraving.