I found the information on the internet ages ago and never tried it until now.So i will share this instructable .

Step 1: Method

Basically the bottom of most cans have a parabolic shape that when polished will allow you to concentrate sunlight and make fire.You can use any polishing agent,I used small grit sandpaper and toothpaste.Work is circular motions and try not to press to hard thus changing the shape of the bottom of the can.You have to carry on until the bottom looks like a mirror and you can see yourself in it.Then use toothpaste or any suitable polishing agent.
I'm making it- Tomorrow, It's Dark here on the East Coast.
did this but it really has to have a high polish
Or just be in really bright sunlight.
cool the trouble is hardly any sun where I live!!!!!!!!
I saw this once on a show called Mythbusters, but these poor guys had to use chocolate to polish it.....and it took freaking long
Interesting, I did theorize about this but never tested it. thx

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