Originally Posted by cat-222ASR
Yeah right sure. You need to get more when it snows.
No, really, snow isn't white. It only appears white to us because of the prismatic affects of ice crystals and our brain's natural tendency to want to find white in what we see.
Snow can vary in what wavelengths it allows to reflect back, but it's usually blueish. The denser the crystals, the more blue it will appear, which is why glaciers look blue to our eyes.
It's why you should never, ever white balance a video camera off it: skin tones will end up reddish, with a slightly orange push.
Likewise, HID lighting, which appears blue, isn't blue at all. It appears that way because there is no red or yellow coloring. In other words, the light is so white, it appears blue, unlike regular headlight bulbs that have a lot of the red and yellow in them. Obviously, there are fake HIDs that are just blue tinted standard halogen bulbs. Those really are filtered blue.