Shinkoukinzoku Pure Copper Grater, Handcrafted, Double-Sided, 160mm X 80mm, Easy-to-Use, Made In Japan, Tsubame-Sanjo, O-6

Unlike machine-sharpened graters, these graters are hand-sharpened, one hole at a time, using a traditional, special engraving technique. This results in exceptional sharpness and allows the grains to grate without separating the fibers and moisture, preserving the nutrients and resulting in truly delicious grated food. The grater is made from copper. Copper's metal ions (copper ion effect) have antibacterial and sterilizing properties that are strong enough to kill even pathogenic E. coli O-162, making it hygienic and safe.

・Never heat in a microwave or place over a direct flame. ・Plain copper products without a clear lacquer coating will discolor. ・Use in moist environments may also result in verdigris. ・The verdigris is harmless, so you can continue using it as is. If you are concerned about this, you can easily remove it by rubbing with a cloth made of vinegar and salt. ・The discoloration described above is not rust, but a coating produced by the copper itself to protect it from oxidation. The color will return to its original state if you polish it with a copper cleaner, but you can also enjoy the change in color of pure copperware by continuing to use it as is. We hope you will consider this change over time to be part of the unique charm of pure copper and use it for many years to come.