The metal buttons are made of metal and the surface will be black after use for a long time.
[China Button Industry Network] to solve the blackening method:
Cut the cling film twice as much as the button, wrap it on the metal button, smooth it, don't have air, screw it up, cross it on the button, and tie it in two turns. Put it in the water again so that the metal buttons will not fade. The reason is that the plastic wrap on the bag isolates water and air; it prevents oxidation, so it does not fade.
For more information, please update: China Button Industry Network
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