Jewelry metals eventually tarnish when exposed to air (a natural reaction to sulfur in the air), leaving a less-than-stellar shine over time. The soft yellow Sunshine® Cloth cleans and brightens jewelry with special non-toxic, non-scratch microfiber abrasives and lustering agents. Used by many top retailers, the cloth effectively cleans tarnish and fingerprints from sterling silver, gold, brass, nickel and copper - just rub the surface. Hands stay clean and jewelry stays beautiful! The polishing action works until the cloth is completely darkened on both sides. Arrives packaged in a tube and ready to use.