The invention relates to a novel grey gold alloy essentially without whitening element such as nickel, palladium and cobalt, characterized in that it contains in addition to the gold, copper, silver and manganese, according to the following proportions in percentages by weight, of:

              gold                           75-78
              silver                          1-10
              manganese                       7-15;
                                              and
              remainder of copper to              100.
This alloy is particularly advantageous for manufacturing jewels, notably by the disposable wax casting technique.

A invenção relaciona-se a uma liga de ouro cinzenta da novela essencialmente sem whitening o elemento tal como niquelar, paládio e cobalt, caracterizados que contem além ao ouro, ao cobre, à prata e ao manganês, de acordo com as seguintes proporções nas porcentagens pelo peso, de: manganês 1-10 da prata do ouro 75-78 7-15; e restante do cobre a 100. Esta liga é particularmente vantajosa para jóias do manufacturing, notàvelmente pela técnica descartável da carcaça da cera.

 
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