Dual-shot adds a second layer of colored, transparent or translucent polycarbonate on top of a base layer to produce secondary color blends and depth effects.

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By the time the makers of cigarettes were fighting against legislation on secondary smoking and the makers of chlorofluorocarbons against regulations to protect the ozone layer, their efforts had coalesced into a general attack on the environmental movement and the regulatory bodies it had brought into being.

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