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copperas SUST.

copperas MINER.

copperas QUÍM.

copperas

زاجٌ أَخْضَر

white copperas

كبريتات الزنك

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Some of his styptics are powerful escharotics and astringents, such as copperas, chalcitis, alum, galls, quicklime, rosin, and frankincense. en.wikipedia.org

Known since ancient times as copperas and as green vitriol, the blue-green heptahydrate is the most common form of this material. en.wikipedia.org

It is thought that oak galls and copperas may have been used in making the ink on those letters. en.wikipedia.org

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