Patent ID: 8198226

Claim:
A color changing paint stripper comprising: at least one penetrant, at least one water insoluble carrier, at least one color visible colorant, at least one thickening agent, at least one wetting agent, water and at least one activator, said penetrant is selected from the group consisting of NMP, methylene chloride, dimethyl adipate, dimethyl glutarate, dimethyl succinate, butyl alcohol, ethyl alcohol, isopropyl alcohol, tertiary butyl alcohol, methyl alcohol, di-iso butyl ketone, methyl amyl ketone, butyl acetate, tertiary butyl acetate, isobutyl iso-butyrate, diethyl ether, ethylene glycol methyl ether, ethylene glycol butyl ether, turpentine distilled steam, aromatic hydrocarbon, cyclohexanone, isophrone, heptane, hexane, kerosene, lacquer diluents, rubber solvent, benzene, chlorobenzene, methanol, cyclohexanol, monoethanolamine and mixtures thereof, and said water insoluble carrier is selected from the group consisting of polysaccharides, starch, cellulose, polydextran, chitosan, chitin, limestone, metal oxides, aluminum silicates, hydrated aluminates, sodium magnesium silicates, barium sulphates, ferroxides, magnesium aluminum silicates and mixtures thereof, said thickening agent being selected from the group consisting of Fullers earth, clay, attapulgite, montmorillonite, magnasol, klucel H, hydroxyethyl cellulose, hydroxypropyl cellulose, methocel and mixtures thereof, said wetting agent being selected from the group consisting of propylene glycol, butylene glycol, ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, pentaethylene glycol, diethylene glycol monomethyl ether, monomethyl ethers of triethylene glycol, tetraethylene glycol, pentaerythritol, dipentaerythritol, neopentyl glycol and mixtures thereof, and said activator being selected from the group consisting of formic acid, acetic acid, glycolic acid, hydroxyacetic acid, chloroacetic acid, fluoroacetic acid, oxalic acid, lactic acid and mixtures thereof, wherein said stripper is designed to be applied to a painted surface and said penetrant removes the paint and said stripper changes color to indicate that the paint has been fully removed by said penetrant.