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O chamado “espelho dourado” é produzido por uma reação de oxirredução em que íons de ouro presentes na solução são reduzidos a ouro metálico, formando uma película brilhante aderida ao vidro. O reagente inicial é o ácido tetracloroáurico , que contém ouro no estado de oxidação +3 dissolvido em meio aquoso, apresentando coloração amarelada. Em seguida, adiciona-se hidróxido de sódio , que torna o meio básico. Esse passo altera o equilíbrio químico do complexo de ouro e prepara o si
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