Reasons for the Color Change in Gold
Gold is known for retaining its natural color over time; however, several factors can lead to alterations in its hue. Below are some of the most significant causes:
Cosmetics
Cosmetics can contribute to the discoloration of gold jewelry over time, especially if they contain metals that are more potent than gold. Prolonged contact between gold and these products may result in a chemical reaction that alters its color.
Oxidation
Gold jewelry is often alloyed with other metals such as nickel, copper, or silver, as pure gold is too malleable. When these additional metals are present in higher proportions, they may oxidize over time when exposed to oxygen and other environmental factors, leading to a change in the appearance of the gold.
Heat and Chemicals
Exposing gold jewelry to fire or heat, such as when cooking, can gradually affect its color. Additionally, contact with chemicals found in perfumes, soaps, and other cleaning products can lead to discoloration of gold pieces.
Swimming
Swimming pools typically contain high levels of chlorine, which can corrode metals, including gold. To maintain the original color of gold jewelry, it is advisable to remove it before entering the pool.
Poor-Quality Gold Plating
Gold jewelry is usually coated with a thin layer of high-quality gold through a process called electroplating to prevent discoloration of the base metal. However, if the plating is of substandard quality or too thin, the underlying metal may show through and cause a change in color over time.
Acidic and Sulfurous Materials
Exposure to materials with high acidity and sulfur compounds can also affect gold jewelry. Common substances such as pickles, fruit juices, onions, spices, and lemons can alter the pH of gold, leading to color changes over time.
How to Maintain the Color of Gold
Adopting a few simple strategies can help preserve the color of gold jewelry. Key practices include:
- Removing gold jewelry when washing hands, showering, or swimming, as cleaning products can dull its shine over time, and chlorine can also cause discoloration.
- Storing gold jewelry in a dedicated box to protect it from environmental factors such as moisture and oxygen.
- Avoiding prolonged exposure to moisture for gold pieces.
- Keeping gold items separate from one another by wrapping them in a soft cloth or other delicate materials. Hanging gold chains can also prevent tangling, friction, and scratches among pieces.
- Regularly cleaning gold jewelry, even if it doesn’t appear dirty, to maintain its brilliance and color. A gentle polishing with a soft cloth like chamois can help retain its shine while minimizing the need for extensive cleaning sessions in the future.