Sulfur was my first quess also, but I would think it would be from the wood you are burning rather than from the galvanized steel. Why the sulfur precipitates not sure, but it might have something to...
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Sulfur was my first quess also, but I would think it would be from the wood you are burning rather than from the galvanized steel. Why the sulfur precipitates not sure, but it might have something to...