sulfide staining; sulphide staining
Technical term for discoloration caused by sulfide formation, often used in materials science, art conservation, or metal corrosion contexts.
To prevent sulfide staining of silver items, wipe them with a special cloth before storing.
The darkening of this painting is thought to be due to sulfide staining of the pigments.
Compound of 硫化 (sulfidation) and 変色 (discoloration). The exact historical derivation is uncertain; the term is a modern technical coinage.