Take, 4 pounds of Irish moss, 3 pounds of methylated spirit, and 3 pounds of Fuller's earth are mixed with 30 pounds of water, the whole boiled, and a solution of 16 pounds of caustic soda and 16 pounds of caustic potash dissolved in 28 pounds of water added, after which the product is let stand until it is cold and has solidified to a brownish gelatinous mass. The proportions of the ingredients may be varied. The compound is used by applying it to the painted surface with a brush, allowing it to remain thus from 20 minutes to one hour and then washing it off together with the paint that has been disintegrated by its action.