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Ceramic supply outfits usually carry anhydrous borax. I've been getting mine for a place called Seattle Pottery. It comes in 50lb bags from them, and cost about $1.50 per pound.
If your fuel/air is correct on your forge, you can forge at very high heats all day long. As long as you remember to thermal cycle you damascus and undo any damage you did. I routinely forge at 2250-2350F when I'm welding/working with damascus.
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