But then again, so are Heat Beads:
http://www.heatbeads.com.au/tip/how-are ... ttes-made/
A combination of charcoal and coal, but apparebtly, according to this retailer, the coal makes up at least 80% of the stuff:
http://www.alfresia.co.uk/heat-beads-4k ... ettes.html
Steve W

