View source for AY Honors/Camping/Fire/Curved glass/en

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A piece of curved glass can sometimes be used to focus the rays of the sun, igniting the tinder.  The glass must be smooth enough to not overly-distort the point of light.  A magnifying glass is the typical sort of lens used for this, but there are other possibilities in a pinch.  

It is [http://wildwoodsurvival.com/survival/fire/ice/index.html possible], for instance, to use a piece of ice shaped into a sphere to do the same job.  Getting the piece of ice round enough and, clear enough, and smooth enough to ignite a fire, however may prove to be difficult.

[http://wildwoodsurvival.com/survival/fire/cokeandchocolatebar/ Others] have reported success in polishing the bottom of a soda can, and using it as a mirror to reflect the sun's rays onto a point.  Again, it takes a lot of patience to polish the can well enough to be able to light a fire this way, but it has been done.  The polishing material can be any fine rouge-like substance, such as clay.  The surprising thing about this particular technique is that a chocolate bar has been used as the polishing compound!
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