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What material is used for the code stamped on eggs and can it penetrate the shell?

April 26, 2017code eggs material PENETRATE Shell stamped Used

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What material is used for the code stamped on eggs and can it penetrate the shell?

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The material used is a food grade dye. Although the egg is porous, dye would only pass through if excessive ink was placed on the egg shell. Skilful application (applying the correct amount of ink) prevents this from happening.