Yeah, baking char in that Altoids tin was just a spur of the moment thing. I usually do it in a larger tin with a good seal and only a pinhole in the top. Old people are sometimes lazy. :grin:
The material is good for char, it is woven and tough, and when I get the bake right it works very well, has been my standard for a lot of years. I use traditional flint and steel, or the lock of whichever gun I happen to be carrying or a burning glass when conditions are right, and it performs very well with either method.
The brown cloth was just an experiment, baked in the toaster oven on a cookie sheet, not enclosed. I was just curious to see if I could make char that way, so that I could directly see the degree of carbonization. I think it will work, I just stopped short of the best final product on that first trial.
The oldest reference to making charcloth I've found, from 1588, describes setting linen cloth on fire and smothering the flame before it is completely consumed. I expect the result isn't far different from that partially burned cloth from the Altoids tin.
When I said, "It burned completely through, but even with me blowing on it constantly it took almost 2 minutes to do it.", I meant that the charcloth retained an ember for a long time even though I was blowing on it, so it would give more time to catch the tinder. As Martha says, that's a good thing.
Spence