A major exhibition about the dangerous lives of the boys and young men who scour slag heaps in search of copper.

It wasn't clear whether grey smoke was closer to black or white, for example. By the 1970s, the straw method had been abandoned in favor of more controllable chemical mixtures .

It wasn’t clear whether grey smoke was closer to black or white, for example. By the 1970s, the straw method had been abandoned in favour of more controllable chemical mixtures .