Kravjitsu

Thanks a lot guys, i know that different substances burn at different temps but i guess she just wanted to know what is the coldest fire? I know it sounds stupid and it might very well be but i think shes talking about the fire you can see thats red yellow and orange, whats the coldest that could be? This is for any substance and probably what ever conditions that would make it coldest. Thanks again the help is appreciated

My girlfriend has been asking me for awhile now about what the coldest temperature fire can be sustained at? Im not a chemist of anything but i figured this would be the right forum to ask it on. She thinks it paper burning at 451 degrees but i have no idea. Any help would be appreciated