Most race teams video record the launch of the car at the starting line. The white line helps to accentuate the tire rotation so it shows up better on the pictures. As far as writing usually the pit crew may simply put an ID number or psi or circumference measurement.Some sportsman racers with dragster write their dail in on the slick. To make wrinkle walls? I have have used a mototool and round bit to carve in the wrinkles and then flatten the bottom, use steel wool to smooth out the appearnce and dull it down. Or just give up and buy them from competition resins. Remember to do each tire separately against the rotation, carve one side with wrinkles going left to right toward the bead for the drivers side and the other right to left. Do not do like Monogram did on the Snake and Mongoose kits and have booth tires the same.