In the lede and seventh graf of BCN5 from Oct. 25 (BIO FUEL EAST BAY PARK), the word “coal” was incorrectly used. The substance created is biochar, not coal. Please read it:
Everything to know about visiting SF’s Angel Island
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X X X Pull a burning log out of a campfire and it will send a smoky plume of carbon and ash into the air. Place that log in a 1,500-degree fan-blown kiln and the carbon and ash will lock down inside the remaining material.
X X X In a process called pyrolysis, the wood is burned at extremely high temperatures, under a curtain of fanned wind in the absence of oxygen. The charred wood is cooled with water and mechanically crunched into bits of dense porous biochar, about the size of construction gravel.
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