Why is my sterling silver cross blackening in some areas?
This is perfectly normal. Sterling silver naturally develops a "patina". This is due to a process called oxidization. We often use this process intentionally to provide depth and contrast to a piece of jewelry. When we are doing it intentionally, we use chemical reactions to trigger rapid oxidization. (Don't worry, none of these chemicals remain on the finished pieces.)
This Celtic Tulip Cross is an example of how we use patina to increase contrast.
Why is the patina changing now?
Oxidization will also happen naturally due to exposure to the air or other environmental factors. The amount and appearance of the patina will vary due to environmental factors such as body chemistry (especially if it is worn against the skin), and chemical exposure (such as swimming pools, or lotions). It can vary widely from one person to another. But it is a natural process that will always occur to some degree. Bronze statues develop a desirable patina naturally as well.
Options
Let it go!
Some people actually like the look that their jewelry takes on as the patina matures. If that's you, you don't need to do much. Maybe just be aware of chemical exposures that might change your patina (hot tubs, harsh cleaners).
Cleaning
If you think that you exposed your jewelry to something that might be causing more oxidization, or simply got it dirty, wash it with warm soapy water. If it's something that won't rinse off, gently use a soft toothbrush. Aggressive cleaning solutions, or ultrasonic cleaners sold for cleaning jewelry, can have unintended effects on your patina. Warm water and mild soap are the safest bet.
Polishing
If you would prefer to reduce the patina and bring your silver back to a bright polish, a polishing cloth is the perfect option. This will not remove the patina from the recessed areas, which is perfect for pieces that have an patina intentionally applied to them. If your jewelry has a texture of some kind, be careful not to remove the finish by excessive polishing. Just take it easy and check your surface as you work. If polishing a chain, place the cloth across your hand and hold the chain very gently between two fingers as you pull the chain through.
De-oxidizing solutions
There are products available that remove oxidization chemically (Tarn-X is an example). But lookout! These chemicals will also remove an intentionally applied patina. They will remove oxidization from recessed areas that a polishing cloth cannot reach. However, they will not bring the metal to a shine. You will still need to polish the surface if you want to bring it to a high polish. If you decide to use one of these products, make sure you follow the instructions. I would recommend testing any of these products in a small inconspicuous area first.
Conclusion
The natural process of oxidization, or patina, is part of what makes sterling silver work exciting. You have several options regarding how you handle the maintenance of the finish on your sterling silver jewelry. I hope this article is helpful. Feel free to contact us if you have any questions.
Sincerely,
Rdr. Philip
Resources
These were available from multiple sellers on Amazon when I last checked:
Blue Sunshine Cloth - Soft cloth for regular polishing.
Yellow Sunshine Cloth - More aggressive than the blue cloth. Great product, but don't overdo it.
Tarn-X - This is particularly useful on oxidized chains. As I mentioned above, follow the directions and be careful.
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