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A. Reasons for Jewellery Blackening or Fading:
1. Silver jewellery turns black when oxidised in the air, exposed to hot sources or strong acids.
2. Stainless steel turns black due to acid, strong alkalis and strong oxygen.
When copper jewellery comes into contact with liquids such as water and sweat stains and is exposed to air, copper chemically reacts with oxygen, carbon dioxide, water and other substances in the air, resulting in rust.
B. How to avoid darkening or fading:
1. Wipe clean with a soft cloth.
2. Remove when bathing and sleeping and store in a dry place.
C. Everyday chemicals:
1. Acids (salt, soy sauce, vegetable soup, acidic juices, etc.)
2. Strong alkalis and strong oxygen (alkali, soda and bleach)