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Signing UpStep 1Gather necessary materials
Crayons and crayon pieces of all sizes and colors
A plastic candy mold (yes, fully aware this purchase is not so "green" but remember you're trying to achieve an "eco-friendly" gift that's also something a kid would actually want to use so you can justify the purchasing this piece of cheap plastic knowing that you'll love this project so much you'll want to do it often)
Extra Items include:
Old cups to melt your crayon pieces into
Spoon
Microwave
Pretty Packaging Items:
Clean cereal box
small plastic treat bags (again not so green--still thinking of a way to package the crayons using a recycled material)
holiday stamp
ink stamp pad
stapler
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im glad to see other people do this as well. we used to have our class do this and sell them to kids at lunch and help keep it going. another fun thing to do is dip crayons in melted crayons of another colore and possibly repeat theyre really fun to use.
Nice inst' ;o)
And here are more solar cooker designs: http://solarcooking.org/plans
This one worked well for me: http://solarcooking.org/plans/DATS.htm
But this one is rumored to be the most proven design: http://www.backwoodshome.com/articles/radabaugh30.html
You could also just put the molds in a dark pot with a glass lid. That should work too.
The principles for this process are:
reflection (bouncing light into a box),
concentration (focusing lots of light into a small area),
transformation (from light energy to heat energy),
radiation (heat energy won't radiate though glass much),
conduction (insulation won't conduct heat away much),
and convection (a sealed container won't let hot air out).
With these principles you can accumulate heat in a cardboard box. You concentrate energy by reflecting light into an enclosure with a clear window. If the light hits something black, the light will transform into heat. So paint the inside of the enclosure black. Heat (infrared radiation) won't radiate through the window very well so it will stay inside with your crayons. To store heat inside the box even if you open it briefly, you can use something dense and heavy like rocks painted black. And to keep heat from leaking out the sides use insulation like layers of cardboard. Also seal the whole box tight to keep hot air from leaking out by convection.
You can put your box cooker out in the sun before you start. The sun will heat up the black rocks in the black box. And when you have your crayons broken up and placed in the molds you will have a nice hot rocks keeping your oven hot to melt your creations quickly.
Or if you want to try something quick and easy, just put the mold and crayons in a ziplock bag in the sun and lay the bag on top of a mirror. This will reflect some extra light back and the ziplock will keep the wind from blowing away all your heat. That might work too.
You probably shouldn't drive anywhere, though.
Kayla
http://www.24hourscienceprojects.com