I recently developed naturaly to see auras but only white, its pretty cool, anywhere thats alive with nature I can see the floating aura around them but how do you see red and blue ?
Well as you said naturally you will see those also naturally. I saw different colors when i placed my hand on a white paper under the sun. The sun rays fell on my hand and i noticed auras in the shadow of my hand. Also concentrate while seeing a aura then pratice and pratice.
Perceived color in auras is personal. You'll see colors only if that's how your own brain communicates what you're seeing. As you should know energy in itself has no color being that it's not reflected light, nor is it physical so it can't reflect light. If you want to see color in auras and you don't already just gear yourself towards color/emotion/conditional associations. Make those associations solid for yourself and you'll possibly start seeing colors.
In truth though, not seeing colors doesn't exactly make it any less informative to look at an aura. You just need to know how to read them by what you associate bodily conditions with.
Auras are made of energy. They make fields of the energy energy being emitted which basically surroud the body. You do not necessarily have to always see them as they were solid objects and not merely fields of the energy which is being emitted and surrounding your body.
There is a stage which many of us have been into including myself, where we sense the energy of a person but are unable to define character vibration and even the emotional vibrations that emanates and translated in our brains' visual cortex (which is what makes the color).
This colorless aura or specifically colored aura is just you perceiving energy like a sonar translating energy to a image in your visual cortex.
This can be a matter of perception. In the modern days, many magic practitioners promote the exercise of energy perception through meditation and visualization just in order to be able to come to a self understanding of energy flow and perception, of course. In that way they can be witnesses and testimonies the way magic and energy flow work and what it has to do with the colors..
Also I would like to add that some magic practitioners may relate the third eye with visual .perception of energy
Being able to distinguish between different energy fields is something that will only be able to come with time and practice. Colors are usually generated as aspects of mood and things going on with the body in and of itself. So attuning yourself with natural empathy can help too.
You have to learn to concentrate and to block your senses when you want too and open them up when you want to. In other words you have to learn control.