What does gold jewelry change color when it comes into contact with?
1, don't touch substances containing acid and alkali, otherwise it will make gold jewelry discolored and dull.
2. Don't touch oily daily necessities, cosmetics and mercury-containing daily necessities, otherwise the gold ornaments will darken or turn white, resulting in "gold amalgam".
3. Some cosmetics or hair dyes contain trace amounts of lead, and gold tends to turn black when exposed to lead.
4. Do not contact and rub with metal substances such as platinum, palladium, silver, aluminum, tin and mercury (mercury), otherwise the contact point will turn white.
Some sweat is waste and harmful substance in human body. When these substances come into contact with silver and copper in gold jewelry, they will react chemically to produce silver chloride and copper sulfide, which will lead to discoloration or fading of jewelry.
6. When silver and copper in gold jewelry contact, silver chloride and copper sulfide will be produced, and dark black chemical salts will appear. This chemical salt often falls from gold jewelry, polluting the wearer's skin and leaving very obvious black spots on the skin.