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Um estudante comprou quase 1,7 kg de agulhas banhadas a ouro por cerca de R$ 17,3 mil. Depois da extração, a balança mostrou apenas 10,97 g. Pela cotação do ouro puro, isso valeria aproximadamente R$ 7,6 mil: um prejuízo estimado em R$ 9,7 mil, sem contar os custos do processo. O brilho de um banho de ouro pode enganar. Você teria apostado nesse lote? #ouro #ouro18k #joias #experimento #ourivesaria agulhas banhadas a ouro, extração de ouro, recuperação de ouro, ouro reciclado, metais preciosos...
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