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But the Leopold clan sees a new empire of wonder-drug riches by harvesting its curative power, including the unicorn’s purple, iridescent blood and the mysterious properties of its occasionally glowing horn.

In places, a film with iridescent swirls could be seen on the surface of the water - a distinctive signature of contamination by oil.

Whether it’s the CD’s glossy, iridescent appearance or the intimate liner notes tucked into every jewel case, the compact disc maintains a certain appeal among young music buyers and collectors.

In the blue room a pile of oyster shells lie on the floor, ready to be ground up and applied to the walls to give them an iridescent shimmer.

But those rainbow trout — identifiable by iridescent colors running down their sides — are blocked from journeying to the ocean and back by man-made barriers.