"Formaldehyde" is a colorless, highly irritating gas. Soluble in water, alcohol and ether. Formaldehyde is gaseous at normal temperature and usually appears in the form of an aqueous solution, which is extremely harmful to human health (see the hazard of formaldehyde). Formaldehyde is very difficult to remove, 1 drop of formaldehyde is dripped on the wood, and then washed with tap water, it takes 28 days.
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