Gold jewelry sometimes darkens for several reasons:
1. Alloy composition:
Gold is usually mixed with other metals such as silver, copper, nickel, or zinc to make it stronger and more durable. These additional metals can react with air or other substances and cause tarnishing.
2. Oxidation:
Some metals mixed with gold can oxidize, i.e. react with oxygen in the air. This can cause darkening or discoloration.
3. Contact with chemicals:
Gold jewelry can darken due to contact with sweat, perfume, cream, cosmetics, hair products or cleaners. These substances can react with the metal alloys and cause darkening.
4. Sulfites:
Silver, often used in gold alloys, can react with sulfur compounds in the air or on the skin to form silver sulfide, which is black in color. This can cause jewelry to tarnish.
5. Humidity and environmental conditions:
High humidity conditions or direct contact with water (especially seawater or chlorinated swimming pool water) can promote corrosion and tarnishing.
6. Acidic skin:
Some people's skin is more acidic due to their natural pH level or certain dietary factors. Acidic skin can cause gold alloy to darken more quickly.
How to prevent gold jewelry from darkening:
- Regular cleaning: Use mild soap and water solutions and a soft brush for cleaning.
- Proper storage: Store jewelry in a dry place, separate from other metals and jewelry to avoid scratches.
- Caution with chemicals: Avoid direct contact with perfumes, cosmetics, hair products and cleaners.
- Removing before swimming or sports: It is best to remove jewelry before swimming in the pool, sea, or playing sports.
Proper care of gold jewelry can reduce the risk of tarnishing and maintain its beauty for a long time.