History
Because it is inexpensive, calcium acetate was once a common starting material for the synthesis of acetone before the development of the cumene process.
Calcium acetate can be prepared by soaking calcium carbonate (found in eggshells, or in common carbonate rocks such as limestone or marble) in vinegar. Since both reagents would have been available pre-historically, the chemical would have been observable as crystals then.
Read more about this topic: Calcium Acetate
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