There is blackening due to sulfurization as it has been used for many years. To prevent any trouble, such as swapping, please refrain from purchasing if you intend to resell or are concerned about appraisals at consignment stores. If you have any concerns about authenticity, we recommend that you purchase from Goros or consignment stores yourself. We cannot accept returns or refunds after purchase, so please understand this before purchasing. Please consider this. Thank you.