There is nothing about parakeets' color that relates to their personality. It is how they are raised and tamed that matters!
the color is rainbow or black
No, They are not naturally blind, but they can become blind if they have an accident to do with their eyes, e.g. Attacks from dogs and cats, car clips, or any injuries done to their eyes.
yes
yes and no one of my green parakeets killed one ather and if you only have one bird its friendlyer
Ultraviolet spectrum
Depending on your Parakeets color, it's perfectly normal for parakeets to not have blue on it's head...
Yes. They are color blind. :)
In short, yes. The key is can those two specific blue parakeets get along. Color doesn't matter, but the two parakeets personalities may clash. If you have had a parakeet for a long time, he may not take kindly to an intruder. Often if you have three, two will bond and pick on the outsider. It is really about the individual birds not the color.
it depends on which color blind test u fail.but id call it part color blind
All dogs are color blind
live wasps are a strong possibility. these will not only blind the parakeet but give it an inflamed head.