A change in the color of gold may occur as a result of several factors, and the most prominent reasons that can lead to a change in the color of gold are:
Effect of chemicals: Gold may interact with chemicals in its environment, such as chlorine, sulfur, or other chemicals. These reactions may lead to a temporary or permanent change in the color of the gold, depending on the type of reaction and the duration in which it is exposed to chemicals.
Corrosion: Gold may corrode over time, especially if it is exposed to moisture, dust, and atmospheric pollutants. Corrosion can cause surface discoloration and tarnishing of the gold, making it appear dull.
Skin reactions: Some skin types and perspiration can cause a change in the color of gold in contact with the skin. This can be due to a chemical reaction between the components of the skin and the minerals in the gold.
Alloys: Low karat gold is usually used in jewelry making because it is soft and brittle. But to improve its hardness and resistance, it is mixed with other metals to form alloys. The use of some other metals such as copper or silver in the alloy may change the color of the gold.
Temperature change: The color of gold can be affected by the change of high temperatures, and repeated exposure to high temperatures may cause the gold to change color or deteriorate.
These factors are not exhaustive, and there may be other reasons for the discoloration of gold. It is good to mention that gold is a chemical element that does not usually rust or corrode, but some color changes can occur due to the factors mentioned above.
