Silver tarnish is a surface reaction, not proof that a piece is fake. Silver commonly reacts with sulfur-containing compounds in the air, forming a darker layer that can appear yellow, brown, grey or black.
Why some pieces tone faster
Humidity, air pollution, storage materials, fingerprints and proximity to rubber, wool or certain papers can accelerate toning. Even pieces stored side by side may change differently because small environmental differences matter.
Prevention is gentler than cleaning
Handle pieces by their edges with clean hands or suitable gloves. Use inert capsules and a dry, stable storage environment. Anti-tarnish products can help when they are designed for enclosed storage and kept away from direct contact with the metal.
Think carefully before cleaning
Abrasive polishing can create hairlines, remove original surface finish and reduce collectable appeal. Chemical dipping can also change a piece. Many collectors prefer natural toning to evidence of harsh cleaning.
If authenticity is the concern, use specifications and appropriate testing rather than judging by colour alone.