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Why are some orbs different colours?
At one time a 'theory' was doing the rounds that different coloured orbs represented different 'types' or 'moods' of 'ghosts'. This idea seemed to be based on the idea that 'orbs' were somehow representations of 'auras'; the idea soon went out of fashion.
However coloured orbs do still excite some comment. When the majority of orbs are white or pale is there not something special - or potentially paranormal - about coloured orbs?
What causes colour in orbs?
The first point to remember is that it has very little to do with the substance (e.g. dust) causing the orb. It also has little to do with any other inanimate objects in the area of the photograph.
Every orb has a 'pattern', caused by minor imperfections in the lens. One common type is a concentric rings. When the distance between such rings (or other pattern elements) is similar to the resolution of the camera, Moiré patterns result. These give an orb false colours. The patterns, and hence the colours, can be removed by most photo software.
Another factor which can cause orb colouring is refraction. When orbs are caused by, say, water droplets colour can be refracted through.
Chromatic aberration can also lend coloured edges to orbs. CA occurs when a lens refracts different wavelengths of light to different degrees.
Why are some orbs white and some pale?
The basic colour of orbs is white. This is not because of the colour of the dust or airborne particle, but because orbs are out of focus points of reflected white light (highlights), as discussed in the explanation section.
A well-illuminated orb will appear as bright white, but those further from the camera flash will appear more pale. Also orbs that are closer to the camera will likely appear pale because the white has been smeared out as the orb becomes more and more out-of-focus.
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