Prussian blue deposit formed in soils contaminated by effluents of chemical industry
Blue billy is a chemical or mineral[i] deposit often encountered in contaminated land.[1]
The name is a reference to its distinctive bright blue colour, which can make it immediately obvious in other mud or soil. Chemically it is a form of Prussian blue. Although several chemical industry processes could produce it, it is particularly associated with coal gasification and older town gasworks. It has been recognised as a problem effluent and land contaminant since the early industrial period and the first gasworks at the start of the 19th century.[2]
As a visible proof of contamination,[ii] blue billy is an important signifier in contaminated land remediation projects and its discovery, especially if undisclosed, may be a cause of contract disputes.[3]
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Bluebilly is a chemical or mineral deposit often encountered in contaminated land. The name is a reference to its distinctive bright blue colour, which...
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included "bluebilly", which is a ferroferricyanide compound—the blue colour is from Prussian blue, which was commercially used as a dye. Bluebilly is typically...