Platinum- this variant was produced by pairing a really pale Kigoi (silver grey ogon) with a Nezu in 1963.
Since then the colour has only improved, to be dazzling white to a very high standard. Shiro Platinum is the whitest form. At Windsor fish hatchery we breed Dositu Platium koi, Butterfly Platinum koi, Standard scale Platinum koi, leather skin Platinum koi all are metallic.
Kin-Gin-Rin (keen-geen-leen) is a reference to a koi's scale type rather than the variety of koi, Gin Rin scale appears silvery when covering white or black pigment. All that glitters Literally.