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Most bottled gas is a mixture of Propane (C3H8) and Butane (C4H10). Butane is longer chain alkane and boils at a higher temperature and gives out more output due to the fact that there are more Carbon to Carbon bonds. It doesn't matter what percentage you add to a bottle as the end result is the same, you burn a hydrocarbon in air (the Oxygen part) and it produces Carbon Dioxide and water and a percentage of Carbon Monoxide which is dependent on how efficient the burn is. A bluer flame is best as it gives a more complete burn and hence lower Carbon Monoxide whereas a yellow flame gives a lower heat output and a higher concentration of Carbon Monoxide. It probably wouldn't have mattered if the poor bloke had used a USA cylinder, the result would almost certainly have been the same.