Methanal is another name for formaldehyde. It has the chemical formula CH2O. It's a colourless liquid. It is the most basic aldehyde. It's an organic compound made up of hydrogen, oxygen, and carbon atoms. formalin is formed when formaldehyde is dissolved in water. This formalin is used in industries as a disinfectant, as a preservative in various food products, and in funeral homes, among other things. Formaldehyde is used in the production of automobiles, explosives, plastics, resins, chemicals, and other man-made things. It is also found in hygienic items such as paper towels, napkins, and tissues.