Doitsu Yellow Hariwake are very popular in the UK 

Hikarimono Muji that have a metallic white ground with yellow to red patterns. As the variety was developed, the pattern came in all shades between yellow and red, but Koi with good red patterns became a separate variety called Kikusui which is basically a metallic Kohaku.

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Originally, the word refered to the contrast of gold and platinum.