Figure 1.

Nickel: its place in the potency spectrum. This figure presents an overview of where nickel seems to fit within the skin sensitization potency spectrum. The most potent sensitizers are at the red end (top); the weakest allergens and nonsensitizers are at the green end (bottom) of the figure. *The 6 groupings are an illustration based on Basketter et al.^8,9 †This offers a rank order based on Basketter et al^8,9 and Kimber and Basketter.^35,63 ‡This list offers a rank order based on Buehler,²² Hicks et al,⁴⁰ and Wahlberg and Boman.⁴¹ §The rank order presented is extracted from the listing previously published.^42,62 CMI/MI indicates chloromethylisothiazolinone/methylisothiazolinone; HC, human category.