I read a claim that wet charred cloth would catch flint/steel sparks. I thought it would be impossible. So I decided to test the claim. While the charred cloth wouldn't ignite where there was water on it, the water was driven off very quickly, and so it was usable in a very short time after being soaked with water.
I am surprised how quickly the charred cloth dried to a usable state, particularly that merely dobbing the water out of the cloth made it dry enough to catch the weak sparks of flint(rock) and steel.
I used a piece of charred cloth that I made using a 100% cotton tee shirt.
First, I demonstrated the charred cloth is initially good by igniting it with flint/steel sparks.
Then I submerged the cloth in water several times and tested its ability to form an ember.
Finally, I submerged the cloth in water, removed it and dobbed it with a napkin, and tested whether it could catch flint/steel sparks.
Here are my results:
1) charred cloth that was wet would not ignite by direct flame.
2) direct flame can dry out the cloth quickly and sufficiently to form an ember
3) merely dobbing the water out of the cloth dries it sufficiently to catch flint/steel sparks.
Observations:
It seems to me that the key is that charred cloth is nearly waterproof. The water beads on it, does not soak into it very quickly or deeply, and dries very quickly.
Here's the video of my Wet Charred Cloth Experiment:
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