Why tyres are always black in colour?
In the early 1900s, it was discovered that adding carbon black to rubber increased the durability and strength of the material. So about 50 percent (by weight) of carbon black began to be added to the rubber, and black tyres began to roll out of the companies.
Perhaps a way could have been found to make them white even after the addition of carbon but everybody found that black tyres were easier to keep clean than white tyres and tyres have remained black ever since.
