Sulphur black

Cobalt octoate is a chemical compound that consists of cobalt ions (Co2+) bound to octoate ions (also known as octanoate ions, C8H15O2-). It is often used as a catalyst in various chemical reactions, particularly those involving the curing of unsaturated polyester resins and the polymerization of vinyl chloride. Cobalt octoate can also be used in the production of coatings, adhesives, and inks. In its pure form, cobalt octoate appears as a dark blue liquid with a characteristic odor. It is soluble in a variety of organic solvents and is typically sold as a solution in mineral spirits or other solvents. The concentration of cobalt octoate in these solutions can vary depending on the intended use, with concentrations typically ranging from 1% to 12%.

Formic acid is a colorless, pungent liquid with a chemical formula of HCOOH. It is the simplest carboxylic acid, naturally occurring in certain fruits and vegetables and in the venom of some ants. It has a wide range of industrial applications as a preservative, antibacterial agent, solvent, and in the production of textiles, leather, rubber, and other materials. It also has some medical applications and is used in organic chemistry reactions as a reducing agent. However, formic acid is highly corrosive and can be dangerous if ingested or inhaled in large quantities.