Orange oil is used to produce flashes.
name: This experiment demonstrates the ignition of orange peel essential oils.
Orange peel contains a lot of essential oils. The main component of orange essential oil is limonene (about 90%). This substance gives oranges their unique smell. From a chemical point of view essential oils of any plant is the mixture of organic substances, such as terpenes and terpenoids, aromatics, saturated and unsaturated hydrocarbons, aldehydes, organic acids, alcohols, esters, and heterocyclic compounds, amines, phenols, organic sulfides, oxides and others. As a rule all these substances are flammable. When orange oil squirts into the flame it creates a flash. The main chemical reaction is the burning of limonene:
C6H10 + 14O2 = 10CO2 + 8H2O
If you put a glass with some alcohol near the candle and spray the oil into the flame you will observe a stronger flash. The reason of this is that alcohol is a high volatile substance and the burning oil ignites alcohol vapor.