I created "ink that changes color when heated."

　誠　文　堂

Product → Heat treatment → We received a request from a customer who was troubled, saying, "I wonder if this has been heat treated... it looks the same..." and we created a solution. Marking on the product → Heat treatment → "The color of the ink has changed, so it has been heat treated..." and that solved the issue. It really changes, so please feel free to contact us. The customer mentioned that it changes from "blue → white" and "pink → white." Also, it seems that it can discolor even without heat treatment for 2 hours and 30 minutes. We do not have the same heat treatment machine as the customer, so it did not change to white... However, products marked "white" can be easily identified as heat treated, and the customer was very pleased. Thank you very much as always. I have also learned a lot. We will provide sample ink free of charge, so please feel free to inquire.

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