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White Out Or A rubber
You can find it at your local Walmart store.
dye them black
black and white because the color is darker on your skin.
Clorox solution
once it goes black it never goes back
yes, just remove all the white.
You can say "caoutchouc blanc" in French to mean white rubber.
Grey is basically black with white mixed into it. As there is no way to remove the white, your color will always be slightly grey no matter how much black you add.
No
Yes, there is a scientific reason. The black is carbon powder added to the rubber. Basically, carbon improves the puncture strength and tread wear resistance to rubber. They were not always black. At one time, most of the pneumatic tires were white. But you were always fixing flats on these tires at the side of the road because the rubber was soft and gummy.
The first could be white, the second could also be white, but for the third there are no white left so the third would have to be black. The first or second could be black, but to guarantee at least one black you need to remove 3 marbles.