|  | Evidence of carcinogenic activity | |||
---|---|---|---|---|---|
 |  | F344/N rats | B6C3F 1 mice | ||
Nickel compound | Ni Solubility | Male | Female | Male | Female |
Nickel subsulfide | Insoluble | Clear evidence | Clear evidence | No evidence | No evidence |
Nickel oxide | Insoluble | Some evidence | Some evidence | No evidence | Equivocal evidence |
Nickel sulfate hexahydrate | Soluble | No evidence | No evidence | No evidence | No evidence |
 |  | Wistar rats |  |  | |
Nickel metal powder | Insoluble | No evidence | No evidence | - | - |