Tarnish refers to the discoloration or dulling of metal surfaces caused by a chemical reaction, typically with sulfur compounds in the air. This reaction forms a thin layer of corrosion on the metal, which can alter its appearance and reduce its shine. Tarnish is most commonly seen on metals such as silver, copper, and brass.
Process
Tarnish occurs when a metal reacts with sulfur-containing compounds in the air, such as hydrogen sulfide. This reaction leads to the formation of a dark, often black, layer of metal sulfide on the surface. For example, silver reacts with sulfur to form silver sulfide, which appears as a dark discoloration.
Metals Prone to Tarnish
Silver
Silver tarnishes relatively quickly when exposed to sulfur compounds, resulting in a dark or black coating of silver sulfide.
Copper and Brass
These metals also tarnish, developing a greenish layer known as patina, which is primarily composed of copper carbonate.
Effects on Jewellery
Appearance
Tarnish can dull the shine and brightness of metal jewellery, making it look old and less attractive.
Surface Layer
Unlike rust, which can penetrate deeply into metals like iron, tarnish generally forms a superficial layer that can often be removed.
Prevention and Care
- Proper Storage: Storing jewellery in airtight containers or anti-tarnish bags can help reduce exposure to sulfur compounds and moisture, slowing the tarnishing process.
- Regular Cleaning: Frequently cleaning jewelry with a soft cloth and appropriate cleaning solutions can help remove tarnish and maintain the metal’s shine.
- Protective Coatings: Applying protective coatings such as rhodium plating on silver can help prevent tarnish by providing a barrier between the metal and the air.
Removal
Tarnish can typically be removed using commercial tarnish removers, polishing cloths, or homemade solutions like a mixture of baking soda and water. Regular maintenance helps keep jewellery looking its best.
Tarnish is a common issue for certain metals, but with proper care and maintenance, it can be managed effectively to keep your jewellery looking beautiful. At Ralph Jacobs Jewellers, we provide expert advice and products to help you care for your tarnish-prone pieces, ensuring they remain bright and stunning for years to come.