/ˈsteɪnlɪs/
with no marks on it, or made of a substance that is not damaged by air or water and that does not change colour:
stainless work surfaces

Stainless wire

Stainless wire, also known as stainless steel wire, is produced through a metal drawing process where wire rods are pulled through a die to create thin wire. This wire is characterized by its high tensile strength, corrosion resistance, and oxidation resistance, making it suitable for a variety of applications.

stained