Zinc Oxide Burning Off as a Blue Flame

Pictured is a blue flame caused when Zinc vapour and oxygen reacts when heated to around 1000°C (in combination with other elements such as copper, silver, gold, hydrogen and nitrogen).

Zinc (Zn) decomposes into Zinc Oxide (ZnO: zinc vapor and oxygen) at around 1975 °C with a standard oxygen pressure. In a carbothermic reaction, heating with carbon converts the oxide into zinc vapor at a much lower temperature (around 950 °C). (Source: Wikipedia)

Zinc Oxide Burning Off as a Blue Flame