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A marking composition includes a polymerizable first material that comprises silicon and a second material capable of extending polymeric chains of the first material, wherein the marking composition is capable of undergoing a change that can be detected optically when the composition is contacted w

A marking composition includes a polymerizable first material that comprises silicon and a second material capable of extending polymeric chains of the first material, wherein the marking composition is capable of undergoing a change that can be detected optically when the composition is contacted with energy.

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1. A marking composition, comprising:a polymer first material comprising silicon;a second material capable of extending polymeric chains of the first material; anda blocked, catalytic crosslinking agent,wherein the marking composition is capable of undergoing a change that can be detected optically

1. A marking composition, comprising:a polymer first material comprising silicon;a second material capable of extending polymeric chains of the first material; anda blocked, catalytic crosslinking agent,wherein the marking composition is capable of undergoing a change that can be detected optically when the composition is contacted with energy. 2. The composition of claim 1, wherein the blocked crosslinking agent comprises a carbamate. 3. The composition of claim 1, wherein the second material is capable of crosslinking with the first material. 4. The composition of claim 1, wherein the second material comprises a polyol. 5. The composition of claim 1, wherein the second material is selected from a group consisting of a diol and a triol. 6. The composition of claim 1, wherein the first material comprises a silicone resin. 7. The composition of claim 1, wherein the first material comprises a combined aromatic and aliphatic substituted silicone resin. 8. The composition of claim 1, wherein the first material comprises a phenyl methyl silicone resin. 9. The composition of claim 1, further comprising a catalyst. 10. The composition of claim 9, wherein the catalyst is selected from a group consisting of a platinum-based catalyst, a zinc-based catalyst and a Lewis acid. 11. The composition of claim 1, wherein the crosslinking agent is capable of deblocking to form an amine. 12. The composition of claim 1, wherein the crosslinking agent comprises a silane. 13. A marking composition, comprising:a polymer first material comprising silicon;a second material capable of extending polymeric chains of the first material; andan optical tag,wherein the marking composition is capable of undergoing a change that can be detected optically when the composition is contacted with energy. 14. The composition of claim 13, wherein the second material is capable of crosslinking with the first material. 15. The composition of claim 13, wherein the second material comprises a polyol. 16. The composition of claim 13, wherein the second material is selected from a group consisting of a diol and a triol. 17. The composition of claim 13, wherein the first material comprises a silicone resin. 18. The composition of claim 13, wherein the first material comprises a combined aromatic and aliphatic substituted silicone resin. 19. The composition of claim 13, wherein the first material comprises a phenyl methyl silicone resin. 20. The composition of claim 13, further comprising a crosslinking agent. 21. The composition of claim 20, wherein the crosslinking agent comprises a silane. 22. The composition of claim 13, further comprising a catalyst. 23. The composition of claim 22, wherein the catalyst is selected from a group consisting of a platinum-based catalyst, a zinc-based catalyst, and a Lewis acid. 24. The composition of claim 13, wherein the optical tag comprises 2,2′-(2,5-thiophenediyl)bis[5-tert-butylbenzoxazole]. 25. A marking composition, comprising:a polymer silicone resin; anda blocked, catalytic crosslinking agent capable of crosslinking with the resin,wherein the marking composition is capable of undergoing a change that can be detected optically when the composition is contacted with energy. 26. The composition of claim 25, wherein the resin comprises a combined aromatic and aliphatic substituted silicone resin. 27. The composition of claim 25, wherein the resin comprises a phenyl methyl silicone resin. 28. The composition of claim 25, wherein the crosslinking agent comprises a carbamate. 29. The composition of claim 25, further comprising a catalyst. 30. The composition of claim 29, wherein the catalyst is selected from a group consisting of platinum-based catalyst and zinc-based catalyst. 31. The composition of claim 25, comprisingabout 10 to about 90 percent of the resin; andabout 0.1 to about 9 percent of the crosslinking agent. 32. The composition of claim 25, wherein the crosslinking agent is capable of deblocking to form an amine. 33. The composition of claim 25, wherein the crosslinking agent comprises a silane. 34. An article, comprising:a substrate; anda marking composition on the substrate, the composition comprisinga polymer first material comprising silicon;a second material capable of extending polymeric chains of the first material; anda blocked, catalytic crosslinking agent,wherein the marking composition is capable of undergoing a change that can be detected optically when the composition is contacted with energy. 35. The article of claim 34, wherein the blocked crosslinking agent comprises a carbamate. 36. The composition of claim 34, wherein the second material is capable of crosslinking with the first material. 37. The composition of claim 34, wherein the second material comprises a polyol. 38. The composition of claim 34, wherein the second material is selected from a group consisting of a diol and a triol. 39. The composition of claim 34, wherein the first material comprises a silicone resin. 40. The composition of claim 34, wherein the first material comprises a combined aromatic and aliphatic substituted silicone resin. 41. The composition of claim 34, wherein the first material comprises a phenyl methyl silicone resin. 42. The composition of claim 34 further comprising a catalyst. 43. The composition of claim 42, wherein the catalyst is selected from a group consisting of a platinum-based catalyst, a zinc-based catalyst and a Lewis acid. 44. The composition of claim 25, wherein the crosslinking agent is capable of deblocking to form an amine. 45. The composition of claim 25, wherein the crosslinking agent comprises a silane. 46. An article, comprising:a substrate; anda marking composition on the substrate, the composition comprisinga polymer first material comprising silicon;a second material capable of extending polymeric chains of the first material; andan optical tag,wherein the marking composition is capable of undergoing a change that can be detected optically when the composition is contacted with energy. 47. The article of claim 46, wherein the optical tag comprises 2,2′-(2,5-thiophenediyl)bis[5-tert-butylbenzoxazole].