A votive candle works quite well, thanks. I got a burn time of about 30 minutes with a big flame. Without the big flame, I'm guessing a burn time of a few hours. I will be making room in my kits for votive candles. By the way, I'm currently interested in fire starting in freezing conditions. So, wax melting is not an issue.
What is an issue is containing the melting wax after the big flame gets going. What kind of candle holder is practical to carry, aluminum foil?
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If you're reading this, it's too late.