When the above dyes are dissolved in the plastic melt, they are distributed in a certain molecular shape. When coloring various plastics, a certain proportion can be directly added to the plastics and evenly mixed to be pre-molded or molded, and the hue concentration can be adjusted according to the needs. In the transparent and clean resin, the dye can obtain bright and transparent shades. If used in combination with an appropriate amount of titanium dioxide and dyes, translucent or opaque shades can be obtained. The dosage can be negotiated according to the needs. The general dosage for transparent shades is 0.02%-0.05%, and the normal dosage for opaque shades is about 0.1%.