Then follows Portugal, with its important output of cupreous pyrites. [Please select]
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Cupreous: the metallic red of pure shining copper. [Please select]
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The sulphur, or, in most cases, cupreous iron pyrites (a combination of iron and copper with sulphur), is burned in specially constructed kilns or furnaces, and the hot gases, consisting essentially of sulphur dioxide with the excess of air, pass through flues in which are placed cast-iron "nitre pots" containing a mixture of nitre (sodium nitrate) and vitriol. [Please select]
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