Hazard class: Specific target organ toxicity, repeated exposure (Category 1). Causes damage to organs through Hazard class: Specific target organ toxicity, repeated exposure (Category 1). Causes damage to organs through prolonged or repeated exposure (H372). Do not eat, drink or smoke when using this product (P270). Hazard class: Reproductive toxicity (Category 1). May damage fertility or the unborn child (H360). Obtain special instructions before use (P201). Do not handle until all safety precautions have been read and understood (P202). Use personal protective equipment as required (P281).Hazard class: Skin and serious eye damage, corrosion or irritation (Category 2, 2B). Causes skin and eye irritation (H315+H320).Solid nickel nitrate is a known human carcinogen by dust inhalation (IARC-1). This solution is much less hazardous, but should still be handled with care.