During the process of vulcanisation of rubber to make it

sheer resistant to make tyres out of it, a certain

proportion of carbon is mixed into it. Without this

procedure the tyres will not be able to withstand the

friction n stress of the road. This carbon is responsible

for giving tyres the characteristic black colour.. When

ozone combines with ultraviolet light from the sun, it

attacks the tire polymer. To prevent tires from rapidly

deteriorating, a sacrificial absorber is used, "carbon

black" - which, fittingly, makes tires black