A Hypomelanistic Boa is a boa with reduced melanin i.e. Black pigment. If you look at hypos compared to regular boas you see lots of oranges yellows and reds. Which tells me these colors are hiding behind the black in a normal boa. In a normal albino black is expressed with the color white. Reds yellows and oranges still show in an albino, but are hidden under the white (black) pigments as the boa darkens. So if you put the hypo gene with the albino gene you are removing all the black areas which overpower the reds and are showing white. So with the reduction of black the reds, yellows and oranges can show through on a sunglow. And that is why sunglows have such intense coloration.
Hope this makes sense it does in my head, but it doesn't always come out that way on paper.
Thanks
Josh

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