When you really watch a modern wood stove burn...I mean really look at everything happening when a peice of wood burns it's a facinating thing to watch. The other day I had a good solid bed of coals from over night burn of a particularly dense chunk of oak that was 99% knot. Early in the morning I had put a couple pine splits on and they were about half burned, and the fire was quite hot. I tossed on a split of sumac and sat down on the hearth to watch. I'm not sure I've ever tossed on a well seasoned split of sumac so I wanted to see how it burned. First thing that happened was I singed hell out of my knuckles....Yup stove is hot enough all right... The back surface of the sumac cought fire in about 3 seconds. Bright yellow flames shot up and into the secondary burn, but it was the bark on the front that I could see throught the glass that was so amazing. From under the loose bark a small wisper of a curl of smoke appeared in about 5 or 10 seconds...the wood was giving up it's gas. The curls stayed there for a bit,...apparently getting dissapated and burned up near the front baffle. Suddenly the bark began to turn black and deep blue flames appear on it's surface...the white curls of smoke lying under the bark remained..protected from the heat somehow. After about 30 seconds blue and deep orange flames appeared and hung in mid air as the heat began to burn the curls of smoke coming from underneath the bark. The flames danced out in front of the wood, completely disconnected from the wood as if appearing by magic. There was no smoke visible where the flames were appearing. Slowly as the wood itself began to burn, the brighter yellow flames engulfed the wood and became mixed with the blue/orange flames and the coffee was ready. It was a nice few minutes of watching the stove. It's one of the reasons I really enjoy burning wood.