There was an article in FSM a while ago where a guy made asphalt out of black-grey acrylic paint and finely ground cat litter. It looked real once laid out, sanded smooth, and lines, etc. painted on it. I don't remember wheit was though.
Gino P. Quintiliani - Field Artillery - The KING of BATTLE!!!
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"People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf." -- George Orwell