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Old November 7, 2012, 06:15 PM   #4
Jim Watson
Senior Member
 
Join Date: October 25, 2001
Location: Alabama
Posts: 11,176
Plastic milk jugs are too inconsistent.

If you want to test penetration and expansion, the best thing is a Fackler Trough, a trough loaded with plastic baggies of water.
On the cheap, old fashioned square waxed cardboard milk cartons are better than plastic.

The conversion is 1.8" of water in bags or 1.5" in cartons = 1" gelatin.
http://www.frfrogspad.com/miscelln.htm#performance

So 15" of gelatin penetration would require 22-27" of water travel.
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