id be careful about how you set up those candles if your not going to be right there with them. it would suck to have a fire bc something fell over or something like that. carpet is extremely flamable. candles definately produce co2 tho. as far as how much exactly, i've looked into it a bit on the net and havent been able to get any realy good info. the color of a candle flame is from soot particles being heated incandescent not from the wax vapor being burned. idk how accurate the $20 co2 test kits are, but if anyone has any good info i would def be interested.