When buying eggs, their shells do not all look the same. Some feel rough, some have marks on the surface that look like water stains, and some have small spots; thin-shelled and soft-shelled eggs also turn up from time to time.
These differences are related to changes in certain stages of shell formation. As the eggshell forms, calcium salts are deposited and mineralized, and pigments are also deposited on the surface. When something changes in one of these stages, the eggshell that eventually forms changes too.
How do water stains, roughness, spots, and thin shells each occur? To find out, we need to look at the details of eggshell formation.
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