Like the thing with the rollers and different coloured silicone. Why do they combine? I would think pressing them together would just make it layered, and would not mix them together.
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The mixing is done with soft silicone. The silicone is supplied in bulk in a soft raw form. It is then mixed with a hardener which starts a chemical reaction which causes it to set into a firm rubber like material.
During the mixing process other additives, like dyes can be added to give the required colour. Once the mixing finishes, the silicone is still soft, and it can be formed into its final shape. After a few hours it sets hard and stays in its final shape.
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