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 .

The 2013 recipe for black smoke consists of a mix of potassium perchlorate, anthracene and sulfur. In this reaction, potassium perchlorate is the oxygen-rich oxidizer, a role it frequently serves ...

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. This has since evolved ...

Additionally, a multicolored mixture of black, yellow, red and colorless polystyrene waste converted to styrene in sunlit conditions at a higher rate (67%) compared to white LEDs (45%). The ...

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 .

Black smoke billows from the chimney on the roof of the Sistine Chapel indicating that the College of Cardinals have failed to elect a new Pope on March 13, 2013 in Vatican City, Vatican.

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 .