They coated the array with a thin film of gold and placed it above a flat, gold-coated sheet of glass.

BBC: 'Cloaking' idea traps a rainbow

For instance, electroplating can be used to coat a thin layer of gold on to a cheap piece of material.

ECONOMIST: MONITOR

Unlike a fiat currency where it can be produced out of thin air, gold takes 1 ton of rock for each ounce and is becoming harder to find.

FORBES: USAA Not Giving Up On Gold

Thin strands of curved white gold lined with what appears to be baguette-cut diamonds make up much of the jewelry piece.

FORBES: The Princess of Monaco's Sea-Inspired Tiara

In the United States, investigators with Homeland Security Investigations, the law enforcement arm of ICE, saw a Frito-Lay Rold Gold bag for thin pretzels in the videos.

CNN: Pretzel bag narrows search for child abuser to U.S.

For next week, given a shortened trading week and likely thin volumes, calling what the direction gold may take could be tricky.

FORBES: METALS OUTLOOK: Gold Eyeing Support At $1,636/Oz

Meanwhile, prices have dropped for three of the four MacBook Air models, which, since their 2008 debut, have been thought of as the gold standard in ultra-thin laptop design.

WSJ: A Laptop Screen That Promises an Eyeful

The cotton fibers are made conductive by coating the fibers, first with gold nanoparticles, and then with a thin layer of PEDOT.

FORBES: Weaving Cotton Transistors For Wearable Computing