摘要：

A chemical solvent is provided which removes the opaque scratch-off coating on lottery and game tickets but not the printed indicia beneath the opaque coating. The chemical solvent utilizes at least one glycol ether or at least one polar organic solvent. The glycol ether consists of a total of at least three carbon atoms. The polar organic solvent consists of a total between one and nine carbon atoms. Diethylene glycol monoethyl ether, mesityl oxide, and ketene diethyl acetal are particularly effective. Polar organic solvents containing a carbonyl, carbon-carbon double bond, carbon-hydroxyl, or carboxylic acid function effectively dissolve the opaque scratch-off coating, such as mesityl oxide. Combinations of polar organic solvents and glycol ethers are also effective for dissolving the opaque scratch-off coating but not the printed indicia beneath the opaque coating.

展开