ISEN-ASTC-L is a service of the Association of Science-Technology Centers
Incorporated, a worldwide network of science museums and related institutions.
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I would avoid naphthalene either in solution or sublimed and 
recrystallized.  Here's a link to MSDS, indicating moderate health 
and flammability hazard.  OSHA exposure limit is 10 ppm, which is 
quite low.  If you can smell it, you're likely above the limit. 
http://www.sciencestuff.com/msds/C2149.html

Sodium acetate and sodium thiosulfate 5-hydrate are both less toxic 
and can actually be reused.  That's my 2 cents' worth.  Do you 
realize computer keyboards no longer have a cent sign?  Jane
-- 
Jane Snell Copes	  Science Outside the Box    651-357-3316 (cell)

Science Outside the Box is a tiny business that celebrates the 
scientist in every one of us.  I am a writer and teacher, and I have 
fun with science every single day.  I'm especially fond of designing 
classes and science magic shows for kids and parents.

"To be an inventor, you need a good imagination and a big pile of 
junk."  Edison

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