Erfani, Lidén, and Midander measured nickel deposited on skin after short contact with metal materials. For all materials tested, single-touch doses were 0.024 to 4.7 μg/cm2. The work is a release-to-skin experiment, not a survey of a finished consumer category.
Key numbers
The low end of that range is stainless steel 316L at 0.024 μg/cm2, with the table printing 0.024 (0.0094; 0.053). Pure nickel is the high end in the same summary, 4.7 μg/cm2, with further pure-nickel touches printed as 4.7 (1.7; 7.8), 9.1 (2.5; 20), 7.2 (3.4; 9.6), and 15 (6.0; 32) μg/cm2. A figure caption that has been read as 64 μg/cm2 was not re-verified as a table cell and is not used. The parenthetical triples are kept as printed. They are not relabelled as a confidence interval unless the table header says so. The header was not fully recovered in the text layer, so the triples stay descriptive.
A REACH nickel-release figure of 0.5 μg/cm2/week is a regulatory comparison cited in this literature. It was not measured as a result in the sentences used here.
Methods (brief)
Short, repeated contact between skin and nickel-containing materials, with nickel on skin reported as μg/cm2. Stockholm affiliation. Materials include stainless steel and pure nickel, reported separately.
Evidence fitness
The dose range supports a skin-exposure statement for short contact with nickel metal and alloys. It does not support a children’s jewelry product row.
Limitations
The full column header for the parenthetical numbers was not recovered cleanly. The 0.024 to 4.7 range is the verified single-touch span. Higher pure-nickel touches are additional rows, not a contradiction of that span’s wording, and they are listed separately.
Related evidence
Update history
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