Preparation method of colorful 18K gold

The invention discloses a preparation method of colorful 18K gold. The preparation method comprises the following steps: S1, preparing 18K gold; s2, carrying out plastic processing on the 18K gold prepared in the step S1 at room temperature to obtain a required shape, wherein annealing treatment is not carried out in the plastic processing process; and S3, the 18K gold subjected to plastic processing in the step S2 is annealed in the air atmosphere, the annealing temperature ranges from 220 DEG C to 370 DEG C, the annealing time ranges from 3 min to 60 min, the colorful 18K gold with the corresponding colors is obtained by selecting different annealing temperatures and annealing time, and the colors comprise light yellow, orange, brick red, brown, purple, blue and blue black. By means of the method, the colored 18K gold can be produced only through conventional jewelry processing production equipment, a series of colors different from those of conventional Au-Ag-Cu series alloys can be achieved, the good proc