Nickel is part of many alloys. To make it more robust jewelry. Also, coins, toys, and tattoo inks containing the metal. Decisive for the health, the content of the metal in the product is not. Rather it depends on, is how much nickel in the skin. Only there it is dangerous: the the nickel ions are indeed much too small to be recognized by the immune system at all. In the skin, but combine them with protein – and to the allergen. Tiny amounts of it are okay, they cause even an allergy. It comes with increased values but to sensitisation, the body reacts also on small quantities of nickel.
Therefore, limits from the beginning are important. The appropriate measure is nickel release rate, the limit is at half a micro gram per square centimeter. Numerous accessories to exceed this ten-fold. More than 17 percent of the studs and piercing articles were rejected. Better it looks in belt buckles, closures and trouser buttons: only five percent fell through the cracks of the federal authority.
Itching: People on all possible materials can have a contact allergy – nickel is often a trigger
Chrome is used mainly for the tanning of leather, eligible for various salts of metal. Some salts are harmless, but harmful connections can lead to unclean processing or very oily leather. Already smallest quantities are able to trigger strong allergic reactions. Therefore, there are strict EU-wide limits. All necklaces, bracelets and rings with frequent skin contact must contain no more than three milligrams of so-called Chrom(iv)-salt per kg of leather. In USA, these limits apply for 2016. And still showed 16 percent of 386 now analyzed samples of leather to high chromium stress. necklaces, bracelets and rings from China were more than twice as often criticised as silver necklaces, bracelets and rings. All in one-third of the surveyed gloves, researchers found high residue levels. No good news in the early winter.