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    Recrystallization. The appropriate recrystallization temperature for a material is also determined by different annealing treatments on cold worked samples carried out at different temperatures. The samples are then quenched in water. As already discussed hardness and structures are determined from polished and etched metallographic surfaces.

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    It s abundance in the earth s crust is 0.004 ppm. 100 of gold found naturally is isotope Au 197. 28 other isotopes can be produced artificially and are all radioactive. Gold along with silver and copper form a column in the periodic table.

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