Forms when alcohol becomes oxidised due to dehydration. The most important ketones include acetone and propanone (CH3COCH3) and methyl ethyl ketone or butanone (CH3COC2H5). Ketones dissolve oils, fats, lacquers, nitrocellulose and vinyl resins. As such, ketones are sutiable for removing a PVAc glue stain. Ketones enter the body via the skin and irritate the mucous membranes and may lead to liver and kidney damage