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https://www.bromley.gov.uk/leaflet/122620/6/402/ch
A product may contain nickel in higher concentrations; however, this only applies where a product has a coating and the coating is sufficient to ensure that the rate of nickel released from parts...
https://www2.oxfordshire.gov.uk/cms/sites/default/files/folders/documents/business/tradingstandards/safety/Nickelinjewellery.pdf
The Dangerous Substances and preparations (Nickel) (Safety) regulations 2005 state that the rate of nickel release from a post assembly must be less than 0.2 micrograms per square centimetre per...
https://www.southwark.gov.uk/assets/attach/2592/Nickel-in-jewellery.pdf
have a nickel release rate greater than 0.5 micrograms per square centimetre per week. Direct and prolonged contact means touching the skin under normal use for continuous periods of time. The...
https://www.hants.gov.uk/business/tradingstandards/businessadvice/safety/jewellerysafety
A product may contain nickel in higher concentrations; however, this only applies where a product has a coating and the coating is sufficient to ensure that the rate of nickel released from parts...
https://www.businesscompanion.info/en/quick-guides/product-safety/jewellery-safety-metal-content
Nickel, lead and cadmium in jewellery are covered by legislation. Products that come into direct and prolonged contact with the skin (for example, earrings, wristwatches, rivets and zips) must not release nickel more quickly than a specific rate.
https://www.blcchemicaltesting.com/chemical-testing/nickel-release-testing-and-analysis/
European standard EN 1811 is the internationally recognised nickel testing and analysis method used to determine the rate of nickel release from jewellery, metals and other items. The nickel test was devised to assess whether articles comply with the requirements of the EU Nickel Directive.
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