During which work process do the fine scratches seen on the surface of the new kitchen tools remain?

Metal stamped out en masse in a factory is uniformly smooth, but traces where hands have brushed across remain directly visible on the surfaces of Aizawa Koubou's kitchen tools.

The fact revealed by official materials regarding these traces is simple. Aizawa Koubou's products undergo manual work for the final finishing treatment, and fine scratches may remain during that manufacturing process^[1][2]. Scratches, unevenness, or dark stains occurring in the manufacturing process can also be observed on the surfaces of tools such as measuring spoons^[3].

Generally, when polishing and shaping stainless steel tableware by hand, fine grains or friction marks inevitably remain on the metal surface. Dark stains picked up during the manufacturing process can also be washed away by wiping them with a small amount of cooking oil applied to a paper towel, followed by washing with a neutral detergent.