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The Chemistry of Eggs & Egg Shells

It makes sense to start from the outside of the egg and work our way in, so let’s begin with the egg’s shell. It’s made primarily from calcium carbonate, the chemical compound which also makes up the majority of sea shells, as well as chalk and limestone. Nanoparticles of calcium carbonate are arranged into ordered crystals by proteins, eventually forming the calcite mineral that makes up the shell. The shell isn’t actually completely solid – it has thousands of tiny pores, around 9,000 on average, which allow gases to pass in and out. As we’ll see later, this can have implications for cooking.

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The Chemistry of Eggs & Egg Shells