noun
sulfide staining; sulphide staining
Technical term for discoloration caused by sulfide formation, often used in materials science, art conservation, or metal corrosion contexts.
銀製品の硫化変色を防ぐため、専用のクロスで拭いて保管する。
To prevent sulfide staining of silver items, wipe them with a special cloth before storing.
この絵画の黒ずみは、顔料の硫化変色によるものと考えられている。
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.