Bought a cute little 10" Sakuma GR showa in Nov 2005 that started losing its sumi when the water warmed up in the spring (and, yes, I know that's a relative term here in SoCal).
By summer there wasn't a single spot of sumi -- not anywhere. I kissed the sumi goodbye and cried a lot but finally got used to my "new" koi. I even got to thinking she was a nice looking GR kohaku.
Then we had a couple of real cold snaps in late Nov, early Dec. Lo and behold a few spots of sumi surfaced from out of nowhere.
*1 Nov 2005
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Don't know what's gonna happen in the long run but its been a fascinating journey so far.
