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If that calcium comes straight from crushed limestone, it’s considered natural, but if it’s isolated from crushed stone and then treated with heat to become more concentrated quicklime, it qualifies as synthetic.

In the scorching heat, they forced the soldiers to dig their own graves, shot them dead one by one and buried the bodies, covering the remains with quicklime, according to a witness.

They were killed and we poured quicklime on them.

Burning vast amounts of wood to convert limestone into quicklime ravaged the forests, which led to soil erosion and water contamination.

Lime clasts have long been observed in the quicklime, or calcium oxide, that was a mainstay of the Roman empire’s concrete mixtures.