Color changing paint removing composition

1. A color changing composition for removing paint from a substrate, wherein the composition consists essentially of the following components:

A. from about 10.0 to about 80.0 percent by weight of N-methyl-2-pyrrolidone, a dibasic ester or a mixture thereof;

B. from about 0.01 to about 1.0 percent by weight of a pigment, dye or mixture thereof; and

C. from about 30.0 to about 60.0 percent by weight of starch;

wherein the composition contains from zero to less than about 2.0 percent by weight free water and wherein the composition exhibits a color change to indicate that paint is removable from the substrate.

2. A composition as defined by claim 1 wherein the composition contains from about 20.0 to about 60.0 percent by weight of N-methyl-2-pyrrolidone.

3. A composition as defined by claim 1 wherein the composition contains from about 20.0 to about 60.0 of a dibasic ester.

4. A composition as defined by claim 3 wherein the dibasic ester is dimethyl adipate, dimethyl glutarate, dimethyl succinate or mixture thereof.

5. A composition as defined by claim 1 wherein the composition contains a solvent selected from ethylene carbonate, propylene carbonate, ethyl alcohol, benzyl alcohol, furfuryl alcohol, tetrahydrofurfuryl alcohol, d-limonene, dimethyl sulfoxide, methyal or mixture thereof.

6. A composition as defined by claim 1 wherein the composition contains from about 30.0 to about 50.0 percent by weight of starch.

7. A composition as defined by claim 6 wherein the starch is potato starch, rice starch, corn starch or mixture thereof.

8. A composition as defined by claim 1 wherein the composition contains from about 0.1 to about 1.0 percent by weight of an inorganic or organic thickening agent.

9. A composition as defined by claim 8 wherein the thickening agent is a silica, metallic silicate, clay, gum, polymer or mixture thereof.

10. A composition as defined by claim 8 wherein the thickening agent is hydroxypropyl methyl cellulose, hydroxypropyl cellulose or mixture thereof.

11. A process for removing paint from a substrate, wherein the process comprises treating the substrate with a composition which consists essentially of the following components:

A. from about 10.0 to about 80.0 percent by weight of N-methyl-2-pyrrolidone, a dibasic ester or a mixture thereof;

B. from about 0.01 to about 1.0 percent by weight of a pigment, dye or mixture thereof; and

C. from about 30.0 to about 60.0 percent by weight of starch;

wherein the composition contains from zero to less than about 2.0 percent by weight free water and wherein the composition exhibits a color change to indicate that paint is removable from the substrate.

12. A process as defined by claim 11 wherein the composition contains from about 20.0 to about 60.0 percent by weight of N-methyl-2-pyrrolidone.

13. A process as defined by claim 11 wherein the composition contains from about 20.0 to about 60.0 of a dibasic ester.

14. A process as defined by claim 13 wherein the dibasic ester is dimethyl adipate, dimethyl glutarate, dimethyl succinate or mixture thereof.

15. A process as defined by claim 11 wherein the composition contains a solvent selected from ethylene carbonate, propylene carbonate, ethyl alcohol, benzyl alcohol, furfuryl alcohol, tetrahydrofurfuryl alcohol, d-limonene, dimethyl sulfoxide, methyal or mixture thereof.

16. A process as defined by claim 11 wherein the composition contains from about 30.0 to about 50.0 percent by weight of starch.

17. A process as defined by claim 16 wherein the starch is potato starch, rice starch, corn starch or mixture thereof.

18. A process as defined by claim 11 wherein the composition contains from about 0.1 to about 1.0 percent by weight of an inorganic or organic thickening agent.

19. A process as defined by claim 18 wherein the thickening agent is a silica, metallic silicate, clay, gum, polymer or mixture thereof.

20. A process as defined by claim 18 wherein the thickening agent is hydroxypropyl methyl cellulose, hydroxypropyl cellulose or mixture thereof.