| 摘要 |
An object of the present invention is to provide a discoloration inhibitor for metals, for protecting metal artifacts, such as those made of silver, copper, and nickel, or their alloys, from discoloration due to sulfur-containing gases such as sulfur oxide (SOx), mercaptans, and hydrogen sulfide, for example, during display or storage of the metal artifacts. A discoloration inhibitor for metals comprising: a fiber having a crosslinking structure and containing carboxyl groups therein, at least part of said carboxyl groups being present as a salt of an alkali metal, an alkali earth metal or ammonia; and fine particles of a metal and/or a metal compound substantially insoluble in water and reactive with a sulfur-containing compound dispersed in said fiber is disclosed. |
