Nickel nitrate is the inorganic compound Ni(NO3)2. The most common form of nickel nitrate is hexahydrate. It is irritating to the eyes, skin and, upon inhalation of the dust, respiratory tract. It may cause skin allergy. Along with most other nickel compounds, nickel nitrate is a carcinogen. Nickel(II) nitrate hexahydrate is widely used in the production of nickel catalysts, by impregnating an inert carrier and decomposing the nitrate.

There is no information about biological and pharmacological application of lead stearate. But is known, that this is a toxic substance which can accumulate inside organism, because it can be absorbed through the skin.

There is no information about biological application only a few articles about pharmacological application of lead fluoride, that this substance was investigated for topical dental caries.

Stannous 2-ethylhexanoate is the stannous salt of 2-ehylhexanoic acid. It is used in the chemical industry as a catalyst for ring-opening polymerization of cyclic diesters in the production of polylactic acid and in the production of urethane foams, silicon, and other polymers.

Cobaltous carbonate is used as a feed additive for ruminants, horses and rabbits (dietary cobalt is needed for vitamin B12 synthesis). Cobaltous carbonate has carcinogen, mutagen and reproduction toxicant properties. Cobaltous carbonate is a skin and eye irritant, and a dermal and respiratory sensitizer. Its dust is a hazard to persons handling the substance. Exposure by inhalation must be avoided.

Lead chromate (previously known as chrome yellow), an insoluble chromium metal salt that widely used as a pigment in the production of paints, coatings, and plastics. Lead chromate possessed tumorigenic, genotoxic and clastogenic properties and was substituted by another pigment, cadmium yellow.