This happens because the oxide which had formed is dissolved away, leaving the original metal.

But restoring the original metal and glass marquee - torn off long ago - seems out of reach.

The original seven known metals had properties in common.

Wherever it occurs, tarnish almost always looks very different from the original polished metal.

Ordinarily, such cleaning processes remove very little of the original metal.

Now you have a shilling that contains perhaps three-fourths of its original metal.

Type N: The entire airframe was left in its original natural metal.

It does not use the original metals but is faithful to the biblical description in every other way.

The original metal will then be left in a fragile state.

In both cases, tin was the original metal.