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There's tin in the soldering wire. Learn to not use too much. Depending on the exact mixture of the WW's you may need more or less than I said for good mould fill out.
If you cast outside keep in mind that one raindrop falls in the pot..the contents of the pot will explode in all directions. A big moth did it once to me too. Long sleeved shirts, gloves and glasses are in order.
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