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Black Ochre








Earth Black, or Prussian Black, is a native earth, combined with iron
and alluvial clay. It is found in most countries, and should be washed
and exposed to the atmosphere before being employed. Sea-coal, and
other black mineral substances, have been and may be used as substitutes
for the more perfect blacks, when the latter are not procurable, which
now seldom or never happens.





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Previous: Black Chalk



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