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Good video. Any prism that creates a focal point can work, including ice.
One other use for a clear bag full of water, UV radiation kills a lot of pathogens so exposing water in a clear plastic bag for at least a half hour to direct sunlight can help make water safer for drinking when it comes from an uncontrolled source.
I have carried a magnifiying glass in my gear since I was kid, along with a tinder kit and a flint and steel. The glass is easiest on a sunny day. The flint and steel cover cloudy weather. The bag/ water idea is pretty cool as an expedient method when conditions allow it. Pretty easy to come by such things lying in the road ditch as litter. I never leave fire creation to chance, so have a hard time envisioning when I might need this method, but it is good info, nonetheless, Murphy never sleeps. And lots of folks leave home unprepared, making techniques like this one of value. Of course, most of the times I have ever NEEDED a fire, it was cloudy, sometimes windy, and usually wet. Bad conditions for using sunlight to start a fire. Murphy, is that you?
In my BOB is a lighter, a small can of lighter fluid for the zippo and the matchcase, with the stormproof matches and the waxed cotton rope, as well as the ferrorod in my pocket is the bic. In my wallet is the fresnel lense and the bit of wire and
a condom, which is all that' needed to make fire with my phone battery. I've never had cause to use anything but the bic and the lighter fluid, and only used the fluid a couple of times, cause I aint dumb enough to be out in the woods without proper clothing and shelter gear.
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