Brown Snow Conditions (Dirty Snow, Any Temperature)
Brown conditions are a quasi-condition. Think of brown conditions as a wrapper on yellow, red, violet and green conditions when the snow is dirty. Blue, orange and pink conditions are sometimes wrapped in brown conditions, but not frequently, as new snow is rarely dirty. Dirt tends to accumulate on top of the snowpack as it melts or is blown in on windy winter days.
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Friction Characteristics
Glide waxes that have graphite, molybdenum, fluoros, or gallium are dirt-repelling and will resist the buildup of dirt on the ski. Also, waxes that are harder to the touch are also much more dirt resistant - providing a glide factor that does not diminish as quickly as you put in the kms. After you wrap up your session skiing on dirty snow, it's important to use a liquid ski base cleaner to clean off your glide zones. You'll be shocked at how much dirt comes off! Definitely, not a great idea to leave all that grime to be mixed into your next wax application.
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Kick Waxing
Grip waxes can be sped up with fluor liquid or fluor powder covers that contain these dirt-repelling compounds. Some Klisters and hard waxes for dirty snow come with dirt-repelling compounds already mixed in. Cleaning off your used grip wax after a session on dirty snow will help a lot for your next ski. Dirty grip wax can get very draggy.