Green flames are often described as the result of incomplete combustion.
Completely Unburned Combustion Gases
Carbon Monoxide – 95%
Hydrogen – 3% Methane + Nitrous Oxide – 1%
Nitric Oxide – Trace Element
Potassium+Sodium+Magnesium+Calcium+Zinc – Trace Elements, less than 0.001%. Fresh leaves have greater burning rates due to greater concentration of chlorophyll in cells near the surface of plant tissues and higher levels of oxygen in these richer regions and produce more glycerol per unit tissue weight. This increases rapid oxidation near the surface which produces more heat that destabilizes flame fronts and ensures good draft-free air flow