noble metal

It is commonly used in opposition to noble metal.

Gold is a noble metal- it does not react with most elements.

The name makes an analogy to the term "noble metals", which also have low reactivity.

Other sources include mercury or even rhenium as a noble metal.

In physics, the definition of a noble metal is even more strict.

This tends to use more noble metals that resist corrosion better.

In addition a part of the "noble" metals are removed together with the gas as a fine mist.

It stood about a foot tall, a simple tall cup made of noble metal.

Who ever heard of a chunk of noble metal this big?

At optical frequencies characteristics of some noble metals are altered.