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 worked in hard metal manufacture. Sodium tungstate was in 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.

 

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