Formaldehyde is the simplest aldehyde with the formula CH2O. It is a reactive, colorless gas that was first synthesized in 1859 and is now a major industrial chemical. Formaldehyde is produced industrially by the catalytic oxidation of methanol in a process called the formox process. It has many uses including as a preservative, embalming agent, and in the production of resins, plastics, and other chemicals. Exposure to high levels of formaldehyde can cause health issues like irritation of the eyes, nose and throat.