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My advice is to rule out man-made causes first, and then confirm with other evidence (EVP, video camera, EMF meter).
You may also find this article from Southwest Ghost Hunters helpful.
If a particle happens to be of a certain makeup or shape, it will tend to absorb certain wavelengths of light and reflect others, thus giving the perception of a certain color.
Paravision has an interesting page on the anatomy of an orb.
Here are a few examples of orb photographs: Not all "orbs" that appear in photographs are paranormal.
In my experience, many of the orbs that appear in photographs can be explained by the flash reflecting off dust, particles, insects, or moisture droplets in the air in front of the camera.
When I would catch one, I would take a few pictures afterwards of the same location, from the same angle, to rule out lighting.However, I would be very cautious when classifying orbs in photographs as paranormal – it's simply too easy for the "orbs" in a photograph to be caused by dust or moisture, reflecting off the camera lens (or the flash).Theory #1 – Color difference in orbs is caused by "chromatic distortion" which is a fancy way of saying that our eyes perceive different wavelengths and shapes as varying colors.They are not in all photos but usually they seem to flock to me.
Most are white but I have caught a few blue ones and even 1 that seems white but has like a pulsating outter ring that's uasually like a rainbow. What does this mean and why would I be attracting them?Other shadow chasers claim that red is a color associated with an energy that seems to be on guard duty (often watching over a last outpost, or a loved one who has died).