Patch testing with sodium tungstate.
Hard metal contains about 90% tungsten carbide. In an investigation of the skin of 853 individuals who are still working or had previously worker in hard metal manufacture, sodium tungstate was included in a patch test with a panel of substances from the environment of the employees. No allergic reactions to tungstate were found. However, irritant pustular reactions appeared in 2.0% of the patch tests. The pustular reactions were often reproducible.[1]References
- Patch testing with sodium tungstate. Rystedt, I., Fischer, T., Lagerholm, B. Contact Derm. (1983) [Pubmed]
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