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With a chemical change, a substance transforms into a different substance. Most chemical changes are irreversible. For example, you cannot unbake a cake or unburn wood. However, there are some chemical changes that are reversible, such as nitrogen dioxide that is chemically changed by heat and then reforms when cooled.
A separate, but different representative example of pinking can be seen with over-oxidized phenols in the presence of certain types of TiO2. (Note: Most forms of discoloration are relatively harmless to the polyolefin, and some people consider the chemistry to be completely reversible.