Editing Timeline of historic inventions (section)

====7th century====
{{see also|7th century#Inventions, discoveries, introductions}}
* '''619:''' [[Toothbrush]] in [[China]] during the [[Tang dynasty]]<ref name=kumar-412413>{{cite book |last=Kumar |first=Jayanth V. |title=Textbook of preventive and community dentistry |year=2011 |publisher=Elsevier |isbn=978-81-312-2530-1 |pages=412–413 |edition=2nd |chapter=Oral hygiene aids}}</ref>
* '''672:''' [[Greek fire]] in [[Constantinople]], [[Byzantine Empire]]: Greek fire, an [[incendiary device|incendiary weapon]] likely based on [[petroleum]] or [[naphtha]], is invented by Kallinikos, a Lebanese Greek refugee from [[Baalbek]], as described by [[Theophanes the Confessor|Theophanes]].<ref>{{Harvnb|Pryor|Jeffreys|2006|pp=607–609}}</ref> However, the historicity and exact chronology of this account is dubious,<ref>{{Harvnb|Theophanes|Turtledove|1982|p=52}}</ref> and it could be that Kallinikos merely introduced an improved version of an established weapon.<ref>{{Harvnb|Roland|1992|p=657}}; {{Harvnb|Pryor|Jeffreys|2006|p=608}}</ref>
* '''7th century:''' [[Banknote]] in [[Tang dynasty]] [[China]]: The banknote is [[Economy of the Song dynasty#The world's first paper money|first developed in China]] during the [[Tang dynasty|Tang]] and [[Song dynasty|Song]] dynasties, starting in the 7th century. Its roots are in merchant [[receipt]]s of deposit during the Tang dynasty (618–907), as [[Four occupations#The shang (商)|merchants]] and [[wholesaler]]s desire to avoid the heavy bulk of [[Ancient Chinese coinage|copper coinage]] in large commercial transactions.<ref name="Ebrey, Walthall, and Palais">Ebrey, Walthall, and Palais (2006), 156.</ref><ref name="Bowman">Bowman (2000), 105.</ref><ref name="gernet 1962 80">Gernet (1962), 80.</ref>
* '''7th century:''' [[Porcelain]] in [[Tang dynasty]] [[China]]: True porcelain is manufactured in northern China from roughly the beginning of the Tang dynasty in the 7th century, while true porcelain was not manufactured in southern China until about 300 years later, during the early 10th century.<ref>Wood (1999), 49.</ref>