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Hi,   We've been playing with an art piece for an exhibit where air 
bubbles form at the bottom of a tube and float up through the clear oil. 
  I can't remember where else we've seen this, but we love the effect.

After playing with some small amounts of food grade lubricating oil 
we've started looking for large amounts.  The trick is finding a clear 
oil in different viscosities that won't break the bank.  Does any one 
have experience with mineral oil or silicon oil?  Can anyone  recommend 
a retailer?

Thanks,
Jay

-- 
Jay Higgins
Program/Exhibit Developer
Providence Children's Museum
100 South Street
Providence, RI 02903
401.273.5437 x137
http://www.childrenmuseum.org
Come play, come learn!

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