Your grandmother's wallpaper could kill a child in its sleep. ☠️ . . . Victorian homes were papered in 'Scheele's Green,' a brilliant emerald pigment made with copper arsenite. In damp rooms, mold on the paste released arsine gas — colorless, garlic-smelling, deadly. Children died in nurseries no one suspected. William Morris, whose family owned an arsenic mine, insisted for decades the panic was overblown. By 1900, a Home Office report described British wallpaper as 'practically arsenic-free.'
Source
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