Hi.
Hao, you are totally right.
That's what we go along with here in Japan too.
Blind Bichirs (even sometimes just damaged eyed) will often turn very dark almost black.
A lot of bichirs are sold here almost black, blind, and labelled as "Super Black".
Nice to seer you around again HAO, where you been?
I had a very horrible thought go through my head just now as I was reading Hao's question, I hope people don't start making their bichirs blind on purpose to get them to look this way.