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in flourotic areas in Tanzania." Physics and Chemistry of the Earth 28: 1097–1104.</ref> There have been numerous studies on what temperatures and charring times produce the best quality bone char, and though the numbers vary most agree that charring temperatures for bones should not be much beyond 500<sup>o</sup>C because at this point the effectiveness in fluoride removal is compromised.<ref name="BCQ" /><br><br>
in flourotic areas in Tanzania." Physics and Chemistry of the Earth 28: 1097–1104.</ref> There have been numerous studies on what temperatures and charring times produce the best quality bone char, and though the numbers vary most agree that charring temperatures for bones should not be much beyond 500<sup>o</sup>C because at this point the effectiveness in fluoride removal is compromised.<ref name="BCQ" /><br><br>


[[File:calcinationtable.jpg|frame|left|Physical Properties of Bones Calcined at Different Temperatures]]
[[File:calcinationtable.jpg|frame|center|Physical Properties of Bones Calcined at Different Temperatures]]


The amount of time the charring is done can vary significantly depending on the quantity of bones being charred and the desired quality. Typically the total charring time is a matter of days, with perhaps a few hours actually at the maximum temperature because it takes a long time to heat up the massive furnaces.
The amount of time the charring is done can vary significantly depending on the quantity of bones being charred and the desired quality. Typically the total charring time is a matter of days, with perhaps a few hours actually at the maximum temperature because it takes a long time to heat up the massive furnaces.
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