What does neighbour stained steel mean?

"Neighbour stained steel" likely refers to a type of steel that has been discolored or stained due to its proximity to neighboring materials or environmental factors. This staining can occur from corrosion, rust, or chemical reactions with adjacent substances. It may also be used in architectural or design contexts to describe aesthetic choices or the effects of aging on steel surfaces. Understanding the cause of the staining is essential for maintenance or restoration purposes.