#OnThisDay 1852: The theory of valence was announced by English #chemist Sir Edward Frankland. This states that any #atom can combine with a specific number of other atoms. ⚛️https://t.co/7vlueKImac
#Chemist & #ourimperial alumnus William Perkin discovered the world's first ever synthetic dye. At Wednesday's innovation themed #impfringe evening artist Saif Osmani will give you a chance to print your own artwork tribute with Perkin's famous #mauveine