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"Have her moved," he cried to Aunt Josephine. "Then have a vacuum cleaner go over every inch of wall, carpet and upholstery." Standing beside her, he breathlessly explained his discovery. "That wall paper has been loaded down with arsenic, probably Paris green or Schweinfurth green, which is aceto-arsenite of copper. Every minute you are here, you are breathing arseniuretted hydrogen.
Quickly he made one test after another. I sniffed. There was an unmistakable smell of garlic in the air. "Arseniureted hydrogen," commented Craig. "This is the Marsh test for arsenic. That wall-paper in Brixton's den has been loaded down with arsenic, probably Paris green or Schweinfurth green, which is aceto-arsenite of copper. Every minute he is there he is breathing arseniureted hydrogen.
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