I was looking up something in Jensen's Krisdisk just now, and happened to stumble across the below pic. If the ensemble is entirely authentic, it seems to suggest that in Yogyakarta it may not have been a custom to have a jejeran be of a darker colour than that of the wrongko.
Of course, this is a sample of only 1, so we really can't extrapolate with any certainty from only this photo.
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