Change MEP colored Ducts (and pipes, etc.) to Black

So very often we link in an MEP Revit file and all their ducts are a different color: Blue Supply Air, Magenta Return air, Green Exhaust, etc. And all their pipes are colored too...Domestic Chilled Water, Hot water, Fire Suppression system, etc.
So how do we change them to be all BLACK.. so they look and print correctly?
This Revit Tip will show you how.

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