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Joyridin: Thanks for the personal attack. I will not stoop to that, however, +/- 3% is not accurate enough to determine if the alloying metals are present in the small concentrations required. You can get close, but if you are looking to determine which Heat Lot of material you have or are trying to discriminate between similar alloys, that presision is inadequate. In aerospace this technique is not allowed by the Mil Specs for determining alloying composition. I wouldn't base million dollar decisions on it. Probably good enough for scrap metal dealers though.