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https://www.rings-things.com/Learn/Nickel-Free/
The Nickel Directive's migration limits are as follows: 0.2 micrograms per cm per week for post assemblies inserted into pierced ears and other pierced parts of the human body 0.5 micrograms per cm per week for other products intended to come into direct and prolonged contact with the skin.
https://athenaallergy.com/pages/the-truth-about-nickel-free-jewelry
Nickel is in a majority of metal items we use because it is inexpensive and adds durability as well as luster to other metals. Costume jewelry, for example, often uses a nickel alloy as the base metal, then uses an overlay or plating process to cover the base metal. If that plating is nickel free it may be safe to use until it starts to wear ...
https://handmadeinconifer.com/pages/hypoallergenic-nickel-free-artisan-handmade-jewelry
The term "nickel free" can be confusing since jewelry marked nickel free is still allowed to contain a very small amount of nickel... but it is such a tiny amount that it takes extremely sensitive instruments to measure it. There is no US standard for nickel in jewelry.
https://www.atsdr.cdc.gov/ToxProfiles/tp15-c1-b.pdf
Some jewelry is plated with nickel or made from nickel alloys. Patients may be exposed to nickel in artificial body parts made from nickel-containing alloys. Exposure of an unborn child to nickel is through the transfer of nickel from the mother’s blood to fetal blood. Likewise, nursing infants are
https://www.self.com/story/jewelry-nickel-allergy
Dec 22, 2017 · Alloyed metals can contain nickel, so 14K gold or gold-plated jewelry can still cause allergic reactions.” For those with nickel allergies, purchasing …Estimated Reading Time: 5 mins
https://nickelinstitute.org/media/3861/201709-nacd-ws-report-brussels-final.pdf
7. The restriction states that the rate of nickel release is not permitted to exceed 0.5 micrograms/cm2/week in articles such as watches and jewellery that are intended to come into “direct and prolonged contact” with the skin.
https://oehha.ca.gov/proposition-65/crnr/clarification-chemical-listing-nickel-and-certain-nickel-compounds-and-request
Since the 1989 Proposition 65 listing of nickel and certain nickel compounds, both NTP and IARC have found that all nickel compounds are human carcinogens. In 1990, IARC issued the monograph Chromium, Nickel and Welding (Volume 49) in its series IARC Monographs on the Evaluation of Carcinogenic Risks to Humans .
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