Dear Paal
Thanks for the nice pictures with different fuels. Sewage mud is dark because there is a lot of carbon in it. The flame is a CO fire and there is a hint if that pinkish flame I associate with Hydrogen combustion (although hydrogen doesn't have a flame colour, some say). But there it is. The pot height (above the fire) is about perfect not to chill the combustion while it is still taking place. Regards Crispin
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