Interesting

He opened a collector’s box of Crayola crayons from 1991, the copper crayon has oxidized on the outside

“All Crayola crayons are made from paraffin wax, stearic acid and color pigment. To manufacture our crayons, the paraffin wax is melted and mixed together with pre-measured amounts of powder color pigments to produce the many colors of Crayola crayons.

The original formulation of Crayola copper and gold colored crayons contained bronze powder, which in the presence of stearic acid will oxidize over time, causing the green color. This oxidation process is the same as occurs on a penny or the “Statue of Liberty” as a result of an acidic environment. We successfully reformulated the copper and gold crayons to prevent oxidation from occurring by using a blend of pigments to achieve the copper and gold colors. This formula change took place during 1994 and continues today in both the copper and gold crayons.”

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