copper sulphate

noun

1. a copper salt found naturally as chalcanthite and made by the action of sulphuric acid on copper oxide. It usually exists as blue crystals of the pentahydrate that form a white anhydrous powder when heated: used as a mordant, in electroplating, and in plant sprays. Formula: CuSO 4

Example Sentences

But there are still concerns that a toxic chemical, such as copper sulphate, might have caused the colour change.

From BBC

Today when industrial-scale food adulteration occurs, such as the 85,000 tonnes of olives treated with copper sulphate that Italian police seized in February, we expect a systemic response.

From The Guardian

Italian officers found 85 tonnes of olives painted with copper sulphate to enhance their green colour.

From BBC

In Mexico in 2014, 40m litres of copper sulphate from a mine owned by Southern’s parent company leaked into a river.

From Economist

Guardian critic Jonathan Jones described the copper sulphate chamber as 'one of the truly worthwhile and significant moments of modern British art'.

From The Guardian