This topic comes up often. Do a search for snow and you will find quite a few topics. As I always answer, keep away from food items (flour, baking soda/powder, sweetener, etc.) they will all yellow over time or be eaten by bugs. The best snow product out there is called MicroBalloons. Woodland Scenics train model products has a large, 32 oz., shaker bottle for only about $8, called (go figure) Snow. It will make quite a few blizzards. All you do is apply some fixative, I use pump hairspray, and sprinkle it on. It is made out of microscopic spheres of styrene plastic and will never yellow, fade, breakdown, etc. Looks great too.

