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I agree with Mike. It is all secondary hi. This hi is located in the most active layer of skin - the epidermis. If you look at asagi with bright beni you will see it is in the head, fins and lateral line and belly areas. The skin is thinner here and epidermis is predominate. The red moves up the body with age. This is not to be confused with asagi that go aka matsuba like ( non metallic). That is a different base gentics at work.
In the case of Kanoko, we see it appear, disappear and sometimes even re-appear before going shiro.
The level of accomplishment in beni today is very high. We have kohaku that produce a density of color cells in all levels of the skin. Secondly the skin is of a type that is thick but translucent with reflecting cells and colorless cells. And thirdly, these selectively bred fish have an ability to produce bright orange red color or yellow orange color from a normal balanced diet without great emphasis on color enhanced food types.
I say this to put into perspective the individual or isolated genetic pool that can produce beni or orangie color later in life. It's an interesting phenomena, no doubt. Just not the trend.
Bradley, any before and after pictures? That would be interesting to see---
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