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Old May 5, 2015   #19
Tapout
Tomatovillian™
 
Join Date: May 2012
Location: NW Indiana
Posts: 355
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Easy.

Bio char can be made from different types of wood each wood has different results. The temperature at which the Bio char is made (basically the amount of oxygen that fuels the fire) determines the amount of ash residue left inside of the Bio char.
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