I believe I said that.
"Dragons" was originally designed to have light colored body (withish/silverish) and what ever colored fins. Their names were based on their fin color. So a red dragon would be light colored body and red fins. A black dragon would be a light colored body with black fins..... and so on.
Blue and green dragons thus far (to my knowledge) have blue and green bodies. They do not meet the original design. This is why I say that they're not true "blue/green" dragons. But they do have dragon scales
..... I hope I make sense.
Perhaps if you look at this link you'd understand what I mean - the last part where he shows an imaginary blue dragon. BTW someone has created this imaginary blue dragon but it doesn't breed true yet.
Sorry to have confused you..... it's just a name thing really, not the scales.