Picture of Make fire with a cooldrink can and toothpaste
I found the information on the internet ages ago and never tried it until now.So i will share this instructable .

Step 1: Method

Picture of 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.
Wasagi6 years ago
I'm making it- Tomorrow, It's Dark here on the East Coast.
kricketone7 years ago
did this but it really has to have a high polish
Or just be in really bright sunlight.
wakojako6 years ago
cool the trouble is hardly any sun where I live!!!!!!!!
gerson26007 years ago
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
darkmuskrat7 years ago
Interesting, I did theorize about this but never tested it. thx