If I remember correctly, there are two different kinds of albino. I don't remember the correct terms for them, but this is how I remember it.
TRUE albinos are actual albinos....they lack ALL pigment in their bodies. Their eyes are all red and their bodies are pinkish clear.
PARTIAL albinos have some lack of pigment, but can have some color (such as the orange you talked about, or the bits of black in their eyes, or some colored spots on their bodies.
And I believe that irridescence isn't pigment. I can't remember what was discussed about it other than it isn't pigment so an albino can have some irridescence.