Platinum Ogon, or Purachina, are white koi whose body shines with the same luster as the
precious metal. These first appeared in 1963, probably from out crossing
Kigoi with the grayish-silver Nezu (short for the Japanese word
for rat, nezumi) Ogon - which remains a variety in its own right.
At about the same time, the Cream Ogon
became popular. This
is a metallic koi, midway between a Purachina and a Yamabuki Ogon. Examples of this breed are very rare.