‘Hikari Mujimono’, or simply ‘Hikarimuji’, is the term applied to a metallic koi of single color.  The term ‘hikari’ translates to ‘metallic.’  Examples of hikarimuji koi are the platinum ogon or purachina, the yamabuki ogon (light yellow), and the orenji ogon (orange).   

Appreciation Criteria

Color

The color of a hikarimuji must be unblemished, uniform, dense, and shiny. Luster of the skin is an important consideration for this koi type.

Pattern

In the absence of patterns on a hikarimuji koi, one simply has to ensure that the head is very clear, i.e., unblemished by black spots and other imperfections. The body, on the other hand, must be of uniform color and also unblemished. As mentioned earlier, luster of the scales and fins (especially the pectoral fins) is important.