which may be 6-carboxy-fluorescine (FAM), hexachloro-6-carboxy-fluorescine (HEX), 6-carboxy-X-rhodamine (ROX), or tetrachloro-6-carboxy-fluorescine (TET) 2. These fluorescent dyes are very expensive.

During the study period, 36 metals were included in the metal series (Table 1). Some of these allergens were the same metal in different concentrations or forms. The metal series has evolved over ...