This is a
graph[1] that got my attention. If you look
closely you will discover an optimal temperature for maximum char production at
about 450 degrees centigrades. This is not a high temperature and is
achieveable with low-tech solutions like the one made by Peter Hirst and many
others.
Sources:
[1] J. Lehmann, “A handful of carbon,” Nature, vol. 447, no. 7141, pp.
143-144, May 2007.
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