Blue Flame

what is the difference between a green flame and a blue flame?

I am thinking about buying a Jet lighter but I have found that they sell them with blue flames and some with green flames is there a difference between them?

Flame color depends on several factors, the most important typically being blackbody radiation and spectral band emission, with both spectral line emission and spectral line absorption playing smaller roles.With increasing oxygen supply, less blackbody-radiating soot is produced due to a more complete combustion and the reaction creates enough energy to excite and ionize gas molecules in the flame, leading to a blue appearance. The spectrum of a premixed (complete combustion) butane flame on the right shows that the blue color arises specifically due to emission of excited molecular radicals in the flame, which emit most of their light well below ~565 nanometers in the blue and green regions of the visible spectrum.
Flame temperatures of common items include a blow torch – which can burn usually up to around 1,600 °C (2,900 °F), a candle at 1,400 °C (2,600 °F),[5] a propane torch at 1,995 °C (3,620 °F), or a much hotter oxyacetylene combustion at 3,000 °C (5,400 °F). Cyanogen produces an even hotter flame with a temperature of over 4,525 °C (8,180 °F) when it burns in oxygen.

Lil B – Blue Flame (music video)