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Gold Color in a PVD Process turns red

2006

We are job coaters and we use PVD Equipment. The process is Titanium coating, then TiN and then Gold over TiN. Of late, we face a peculiar problem: The Gold color turns slightly reddish when we touch the Plated surface with bare finger. When we wipe the plated surface with a clean cloth and then attempt to touch again with bare finger, there is no Reddish change of color.

Can anyone help to identify the problem?

Thank you & Best Regards,

Srinivass NV
- Hosur, India

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