It is a galvanized metal sheet with different sizes of scratches and pitting.

The crystallized pattern defines the signature of galvanized iron.

Galvanized metal is commonly used for covering wooden structure. Usually, construction workers simply nail them on wooden parts.

It is also used to make water tanks.

It is a cobalt or nickel like metal plate. The surface has been hammered, so it is very uneven and bumpy. The surface is also oxidized affecting the reflection.

This texture composes of multiple corrugated sheets of metal stacking on each other. The wavy shape of corrugated metals makes it stands out among other metals.

If you look at it carefully, you will find there are rusty cuts and scratches.

Have you ever noticed what the metallic texture of a train is ? This texture can be found on doors of underground trains. When your face is pushed to a train door during rush hours, you will discover the surface of train doors are covered with well aligned tiny crosses.

Obviously, it is an aluminum foil with a lot of wrinkles. It keeps the high reflectivity of aluminum though it is highly crumpled.