I only experimented with one of the white ones that came with the kit. They were individually wrapped, in such a way that it wouldn't fit well into the stove. They lit fine with a match. I'll try one of the yellowed ones, as soon as my boss stops bothering me to get some work done. I kind of wanted to keep them together as a package, because that would seem to be the nicest way to pack it. It's just $1.75, I can get more. But yah, the yellowing is suspicious, and you have to be wary of things you get at a surplus store.