Pop Rocks is a carbonated candy with ingredients including sugar, lactose (milk sugar), corn syrup, and flavoring. It differs from typical hard candy in that it creates a fizzy reaction when it dissolves in one's mouth. Although still popular, Pop Rocks are regarded nostalgically as an aspect of 1970s pop culture. The concept was patented by General Foods research chemist William A. Mitchell in 1956. The candy was first offered to the public in 1975. In 1983, General Foods withdrew the product owing to its lack of success in the marketplace and to its relatively short shelf life. Distribution was initially controlled to ensure freshness; but with its increasing popularity, unauthorized redistribution from market to market resulted in out-of-date product reaching consumers. After that, Kraft Foods licensed the Pop Rocks brand to Zeta Espacial S.A. who continued manufacturing the product under Krafts license. Eventually Zeta Espacial S.A.
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