‪ Bytesize‬ ‪Science‬: ‪The Chemistry of Egg Dyeing‬

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Summary: With millions of eggs about to have their annual encounter with red, green, blue and other dyes this holiday weekend, our newest video helps uncover the chemistry behind this "egg-cellent" tradition. The video features Diane Bunce, Ph.D., professor of chemistry at Catholic University of America. Bunce explains, for instance, why vinegar is so important for eggshell to take up dye. Eggshells consist of calcium carbonate, the same chemical that makes up marble chips. But try to dye a white marble chip. Nope -- won't work! So what is it that makes eggshells dye-friendly? The video explains that egg shells have a "protein cuticle," which reacts with vinegar- based dyes in a way that allows dye to bond to the exterior of the egg. Find out more in the video.