Why jewelry turns your skin green

That green or black mark on your finger or neck does not mean the jewelry is fake or that you have a health problem. It is a chemical reaction.

What happens #

Copper and some alloy metals react with sweat, skin acids, lotions and water. They form green copper salts that deposit on the skin. It is most common with costume jewelry, brass, bronze and low-purity silver or gold.

It is harmless #

The mark washes off with soap and water. If it itches, reddens or blisters, it may be an allergy, for example to nickel. In that case see the guide to hypoallergenic jewelry.

How to prevent it #

• Choose materials that do not react: 14 or 18 karat gold, platinum, titanium, 316L stainless steel.
• Avoid wearing the piece with lotion, perfume or heavy sweat.
• On a piece that already leaves the mark, a clear jewelry lacquer makes a temporary barrier.

See also #

• How to clean costume and fashion jewelry
• Hypoallergenic jewelry and nickel allergy
• Jewelry that does not tarnish or stain: which materials to choose