Ran across this bit over at the excellent amazingribs.com site:
Dr. Blonder explains that the color depends on the particle size and how it scatters and reflects light to our eyes. Pale blue smoke particles are the smallest, less than a micron in size, about the size of the wavelength of light. Just because you can't see it, doesn't mean it's not there. Pure white smoke consists of larger particles, a few microns in size, and they scatter all wavelengths in all directions. Gray and black smoke contains particles large enough to actually absorb some of the light and colors.
Mod note: Link removed per user agreement. Site linked was "amazing ribs"
Yep, great site also, lots of deep info. Helped me a lot when I first started smoking food.
Still my go to for smoked turkey.
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