Shiny stainless steel coffee pot. Purchased at an antique shop. [Used] - Brand: Yukawa - Material: Stainless steel - Type: Coffee pot - Color: Silver [Description] Slight discoloration on the welded part inside the stainless steel. (Photo 10) Therefore, I contacted Yukawa's head office (Sanpo Sangyo Co., Ltd.) in Tsubame City, Niigata Prefecture. The person in charge's response was as follows: "① Regarding the M5 coffee pot, since it is made entirely of stainless steel, there is no risk of it being toxic to the human body due to deterioration from use, so you can continue to use it without worry. ② Stainless steel is also mainly iron, so depending on how it is used and the welding sparks, the stainless steel film may be damaged, and the internal iron may oxidize and appear black in some areas, or the welding marks or build-up may be visible. However, it is not toxic to the body. Please purchase only if you understand the above. Also, please consider using it as interior decoration. Thank you.