SOm of my piezos, after weeks, have got a kind of red like copper color on the ceremic. They seem like old, rusty, and the give the impression of not working but in deed they work. Other piezos I had in the same place did not get this color. Why some piezos adquire this color? Maybe air contact? I have now covered the ceramic of the new rim piezos I am installing with tape, in case air is making them rusty.
Do you know why this phenomenom happen?
Do you know why this phenomenom happen?
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