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Contact dermatitis caused by household products are often attributed to metals. Allergic metals present in accessories (like earrings), metallic household products (like belt buckle and wristwatch belt), and dental implants. Meanwhile, in patients who suffered allergic contact dermatitis due to sports stocking, chromium was detected in the stocking, and positive reactions to Cr in patch tests have been reported. In such cases, a Cr-containing dye was considered to be present in the stocking. Mordant dyes and metal complex acid dyes are the main dye candidates that contain metals such as Cr in their chemical structure, and they have been used in nylon, wool, and silk. Various kinds of these type dyes have been developed and used for textile products. Some examples of these dyes are shown in Fig. 1. Although these metal-containing dyes have been used since a long time, the use of such dyes, which are prepared by treatment with potassium dichromate or chemicals containing Cr and Co, in textile products are restricted by Eco-Label in the European Union. In Japan, the use of these dyes is decreasing because of their toxicity, adverse environmental effects, etc. However, there is a lack of adequate information about these dyes and metals in textile products Chromium and Cobalt Concentrations in Textile Products and the Amounts Eluted into Artificial Sweat