The skin quality of a good koi should be bright and lustrous. It should appear almost like fine porcelain. on a scaled fish, the edges of scales should be barely discernible. Skin quality can be a difficult thing to determine for novices, as there are five different types of skin on a koi - scaled, Doitsu (no scales), Metallic scaled skin, Gin Rin (metallic) scaled, and metallic Doitsu. Metallic scaled and Gin Rin skin should be very bright and even across the body, remembering that Gin Pin scales only normally extend across the top of the body, not the sides. Scales should also be in even straight lines, not ragged or twisted. In Gin Rin scalation, the Gin Rin should be very bright, each scale is effectively a small mirror, and it should be even from head to the tail and down both sides of the dorsal fin. Doitsu fishes are easier to judge as the skin should be simple but clean, bright, and very even with no discoloration regardless of the Koi's color or pattern.
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