A historic finishing technique using layers of heavy, dark varnish or resin that is baked onto a surface. In woodworking, it is most famous for protecting the cast iron bodies of traditional hand planes and machinery from rust. On wood, it serves as a thick, glossy black coating imitating Asian lacquerware.
Heard on the job
I found an early Stanley No. 4 at the flea market with about ninety percent of its original japanning intact.
Insider tip
Restorers often use cold-cure engine enamel to replicate the look of a japanned finish on antique hand tools.