Domestic Encyclopædia (1802)/Black Wadd

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Domestic Encyclopædia (1802), Volume 1 (1802)

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Edition of 1802.

2850276Domestic Encyclopædia (1802), Volume 1 — Black Wadd1802

BLACK WADD, in mineralogy, is a kind of ore of manganese, remarkable for its property of taking fire, when mixed with a certain proportion of lintseed-oil. It is found in Derbyshire, and is a useful ingredient in paints; for on being ground with a large quantity of oily matter, it loses the property above-mentioned.