With Purple Gold and Bouncy Metal, a Canadian Chemist Shines on YouTube. Disillusioned with grad school, Nigel Braun dropped out to film chemistry videos in his parents’ garage in Montreal.

According to traditional heraldry rules, a coat of arms needs both colors and metals; there are five choices of color: purple, green, red, blue and black, and the metal choices are limited to ...

Part of the challenge for conservators is determining whether gold colouration is intentional. Since Roman times, artisans have created purple pigments by dissolving gold in a solvent called aqua ...

It might sound strange that the presence of gold should color something purple, but there’s actually some pretty strong circumstantial evidence to support the idea.