Catechol, also known as pyrocatechol or 1,2-dihydroxybenzene, is an organic compound with the molecular formula C6H4(OH)2. It is a crystalline substance with a distinctive phenolic fragrance.

Propylene glycol is a viscous, colorless liquid that is nearly odorless but has a faintly sweet taste . It is a diol with the chemical formula C3H8O2.

Methyl ethyl ketone peroxide (mekp) is a liquid chemical compound from the family of ketone peroxides that it is used to initiate the polymerization of unsaturated polyester and vinylester resins at different curing temperatures.

Aniline, also known as aminobenzene, is an aromatic amine with the chemical formula C6H5NH2. It is a flammable colorless to slightly yellow liquid with a sweet, amine-like odor, and it turns brown upon exposure to air and light.