I have a question about this. I have an "albino tiger" that is very orange-red. When I got him, his whole body was the color of a tiger barb's nose, and you could see the lighter stripes pretty well. At the time I bought him, I thought it was just some kind of genetic abberation... a product of selective breeding. The color was bright but not impossible, given the bright orange of the tiger barbs' noses and fins.
As he has grown, his color has become lighter - although he is still darker than your average "albino" tiger. He has always been very healthy, and it never occurred to me that he might have been dyed... I didn't even know that they dyed tiger barbs!
There is a picture of my guy in my gallery... although it's not really clear - you try getting tiger barbs to sit still! I'd like to know if this kind of color is produced by dying or if it is just some cool mutation. I don't want to knowingly buy any dyed fish, and want to know what to avoid in the future...