What lighter fluid or fuel burns the coldest?

Among common lighter fluids, butane typically burns at a lower temperature compared to alternatives like propane or white gas. The combustion temperature of butane is around 1,970 degrees Fahrenheit (1,080 degrees Celsius), which is cooler than that of propane, which burns at about 3,600 degrees Fahrenheit (1,982 degrees Celsius). Therefore, if you're looking for a lighter fluid that burns relatively cooler, butane is a suitable choice.