1799 - Joseph Black died.

William Ramsay/The Gases of the Atmosphere 1896

Black was a Scottish chemist who was one of the founders of thermochemistry. He discovered that when ice melts, the temperature does not change leading to the idea of specific or latent heat. He also researched carbon dioxide or what he called 'fixed air'. This research led to the discovery of bicarbonates.

1764 - Andrés Manuel Del Rio was born.

Rio was a Spanish mineralogist who discovered the elementvanadium. He named the his discovery pancromium and sent his samples to be verified. They were mistakenly identified as chromium and his claim was rejected. Twenty nine years later, Swedish chemist Nils Sefström rediscovered the element and named it vanadium.