If you own a car, you have undoubtedly seen that the borders of the glass have some black lines and spots. It was a better option than a metal support when automobile manufacturers started employing adhesive to keep the window stable in the 1950s. Although more secure, the adhesive was still unsightly.
The glue is concealed by the black tint, which is actually a ceramic shade. In addition, the ink has been baked, making it unbreakable. It holds the window in place while also concealing the glue. The dots, on the other hand, serve to artistically transition from opaque glass to thick black lines.
It is not random how many points you get. The further out from the black line they are, the rarer they grow. Even still, dots are not merely ornamental. In addition to the decorative appeal, they also serve the function of controlling temperature. The glass is heated during manufacture in order to allow for bend. Glass with a black tint warms up more quickly than other types. The dots serve to somewhat more evenly disperse the heat, which reduces the likelihood of cracking.
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