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Hi Emily,

A supersaturated solution of sodium acetate will crystallize instantly when 
seeded with a small crystal of the same chemical.   This is the stuff found in 
the reusable, microwaveable heat packs, and you can also get it from science 
supply companies.   You can see an example at:

http://jchemed.chem.wisc.edu/JCeSoft/CCA/CCA3/MAIN/ACETATE/PAGE1.HTM

You could also make a saturated solution of epsom salts in isopropyl alcohol 
(rubbing alcohol).   Pour it over a glass pane and within a minute or so, you 
will get a glaze of needle shaped crystals.   They are small, but easily 
visible.

Hope this helps.

Robert Krampf
Robert Krampf's Science Education
Free science videos, Experiment of the Week email list, and much more
www.krampf.com
Blog:   www.thehappyscientist.com 


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