Piezoelectric Diaphragms FAQQPlease explain the reasoning behind the discoloration (from white to brown) of the electrode in the Piezoelectric Diaphragm.

The electrode for the Piezoelectric Diaphragm consists of Ag(Silver).
Ag(Silver) has the chemical characterization that when reacting with S(sulfur) content in the air it is tarnished to a brownish color. Please confirm solder-ability and characteristics for the products regularly as they may be degraded.
Piezoelectric Diaphragm

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