{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,4]],"date-time":"2026-10-04T22:53:05Z","timestamp":1791154385954,"version":"4.1.0"},"reference-count":22,"publisher":"Wiley","license":[{"start":{"date-parts":[[2026,10,4]],"date-time":"2026-10-04T00:00:00Z","timestamp":1791072000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,10,4]],"date-time":"2026-10-04T00:00:00Z","timestamp":1791072000000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"funder":[{"DOI":"10.13039\/501100007036","name":"Milj\u00f8styrelsen","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100007036","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Contact Dermatitis"],"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Hairdressers frequently perform wet work, which weakens the skin barrier. Repeated skin contact with metallic tools introduces an occupational allergen exposure. However, data on nickel and cobalt release from commonly handled cutting tools remain limited.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Objectives<\/jats:title>\n                    <jats:p>To estimate nickel and cobalt spot\u2010test positivity in hairdressing tools used in Danish hair salons.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Materials and Methods<\/jats:title>\n                    <jats:p>In this cross\u2010sectional field study, 58 voluntarily participating Danish salons were visited from 1 March to 30 June 2026. Scissors, hair clippers and razors were each tested once for nickel with dimethylglyoxime and for cobalt with nitroso\u2010R salt colorimetric spot tests.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Among 266 tools (167 scissors, 95 hair clippers and 4 razors), 37 (13.9%) were positive to nickel and 18 (6.8%) to cobalt. Nickel positivity was 15.6% in scissors and 10.5% in hair clippers; cobalt positivity was 6.6% and 6.3%, respectively. At least one positive tool occurred in 22\/58 (37.9%) salons for nickel and 12\/58 (20.7%) for cobalt.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Nickel and cobalt release from commonly used hairdressing tools is a prevalent occupational hazard. These findings underscore the necessity of proactive preventive strategies, such as careful material selection and stricter regulatory oversight.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/cod.70261","type":"journal-article","created":{"date-parts":[[2026,10,4]],"date-time":"2026-10-04T22:34:36Z","timestamp":1791153276000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Occupational Exposure to Nickel and Cobalt From Hairdressing Tools: A Cross\u2010Sectional Study in 58 Danish Salons"],"prefix":"10.1111","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-1580-4671","authenticated-orcid":false,"given":"Kian","family":"Karimian","sequence":"first","affiliation":[{"name":"Department of Dermatology and Allergy, National Allergy Research Centre, Herlev and Gentofte Hospital University of Copenhagen  Hellerup Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-2780-3604","authenticated-orcid":false,"given":"Daniel","family":"Isufi","sequence":"additional","affiliation":[{"name":"Department of Dermatology and Allergy, Herlev and Gentofte Hospital University of Copenhagen  Hellerup Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4181-0926","authenticated-orcid":false,"given":"Ulrik","family":"Ahrensb\u00f8ll\u2010Friis","sequence":"additional","affiliation":[{"name":"Department of Dermatology and Allergy, National Allergy Research Centre, Herlev and Gentofte Hospital University of Copenhagen  Hellerup Denmark"},{"name":"Department of Dermatology and Allergy, Research Centre for Beauticians and Hairdressers, Herlev and Gentofte Hospital University of Copenhagen  Hellerup Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-9756-656X","authenticated-orcid":false,"given":"Jakob Ferl\u00f8v Baselius","family":"Schwensen","sequence":"additional","affiliation":[{"name":"Department of Dermatology and Allergy, National Allergy Research Centre, Herlev and Gentofte Hospital University of Copenhagen  Hellerup Denmark"},{"name":"Department of Clinical Medicine, Faculty of Health and Medical Sciences University of Copenhagen  Copenhagen Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3537-8463","authenticated-orcid":false,"given":"Jeanne Duus","family":"Johansen","sequence":"additional","affiliation":[{"name":"Department of Dermatology and Allergy, National Allergy Research Centre, Herlev and Gentofte Hospital University of Copenhagen  Hellerup Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2442-5735","authenticated-orcid":false,"given":"Mikkel Bak","family":"Jensen","sequence":"additional","affiliation":[{"name":"Department of Dermatology and Allergy, National Allergy Research Centre, Herlev and Gentofte Hospital University of Copenhagen  Hellerup Denmark"},{"name":"Department of Clinical Medicine, Faculty of Health and Medical Sciences University of Copenhagen  Copenhagen Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,10,4]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/cod.14048"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600\u20100536.2011.01935.x"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1111\/bjd.18946"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1111\/cod.14170"},{"key":"e_1_2_9_6_1","first-page":"7","article-title":"Commission Regulation (EC) no. 552\/2009 of June 2009 Amending Regulation (EC) no. 1907\/2006 of the European Parliament and of the Council on the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH) as Regards Annex XVII","volume":"64","author":"REACH","year":"2009","journal-title":"Official Journal of the European 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Contact With the Skin\u2014Definition Building for Nickel","author":"European Chemicals Agency (ECHA)","year":"2014"},{"key":"e_1_2_9_20_1","doi-asserted-by":"publisher","DOI":"10.1111\/cod.13136"},{"key":"e_1_2_9_21_1","doi-asserted-by":"publisher","DOI":"10.1111\/cod.14264"},{"key":"e_1_2_9_22_1","doi-asserted-by":"publisher","DOI":"10.1111\/cod.14207"},{"key":"e_1_2_9_23_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600\u20100536.2010.01709.x"}],"container-title":["Contact 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