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For centuries Rock Candy has been recognized as having marked therapeutic and preservative qualities. In fact, in the West, sugar was used only as a medicine or preservative up to the middle of the 18th century when people "discovered" it made a sweet treat as well. The earliest known date that white sugar was refined was about 200 C.E. so it is probable that the further refining into what was later known as "Sugre Candie" was at about that time.