Dasi,
Very insightful information. This is one case where ADD really helps solve issues. I like the scientific approach you took going as far as weighing the tanks.
Another artist who used to frequent here found that the location you purchase the propane from can make a difference. If you are trying to bring up the metals, a "dirty" propane can be more effective. Places that don't turn over their product as often are the best places to buy.
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Henry David Thoreau
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