 |
 1964 Print Edo Period Shelf Makie Water Plantains Gold Foil Lacquer Korin Japan $48.95 Time Remaining: 28d 15h 44m Buy It Now for only: $48.95 |
 GOLD FOIL PISCATOR MAP OF THE WORLD $16.95 Time Remaining: 3d 17h 27m Buy It Now for only: $22.95 |
 Vintage Lionel Barrymore Gold Foil Etch Set 247 112 $11.99 Time Remaining: 3d 21h 47m Buy It Now for only: $11.99 |
 CHOICE OF ONE OF 4 FRAMED LIONEL BARRYMORE GOLD FOIL ETCH PRINTS $15.00 Time Remaining: 24d 21h 52m Buy It Now for only: $15.00 |
 GOLD FOIL BLAEU MAP OF THE WORLD $16.95 Time Remaining: 13d 17h 32m Buy It Now for only: $16.95 |
 Brooke Burke 22x34 Sexy Gold Foil Poster 2003 $19.99 Time Remaining: 22d 6h 51m Buy It Now for only: $19.99 |
 GOLD etch FOIL HORSES RIDERS AND DOGS pics HIDE AND SEEK by PALENSKE FOX HUNT $6.95 (1 Bid) Time Remaining: 1d 22h |
 1914 Chevrolet Royal Mail Roadster Gold Foil Print General Motors $18.00 Time Remaining: 29d 12h 53m Buy It Now for only: $18.00 |
 J Hardelin RARE gold foil Manifestations Gallery Poster lighthouse boats SIGNED $169.99 Time Remaining: 26d 20h 44m Buy It Now for only: $169.99 |
 Print On Gold Foil Paper Lionel Barrymore Rocky Point $5.00 Time Remaining: 2d 56m Buy It Now for only: $5.00 |
 Beautiful Matted Gold Dragon Foil Art Print CLEARANCE $3.55 Time Remaining: 23d 15h 5m Buy It Now for only: $3.55 |
 Framed Gold Foil Print by Lionel Barrymore Courtyard Venice 1950s Boats Worker $13.59 Time Remaining: 23d 13h 54m Buy It Now for only: $13.59 |
 Two Gold Foil Prints Churchill Ettinger Pintails And Nailed Down $12.99 Time Remaining: 21h 5m |
 GOLD FOIL DE WITT MAP OF THE WORLD $3.95 Time Remaining: 12d 17h 34m Buy It Now for only: $3.95 |
 4 OLDER CHURCHILL ETTINGER GOLD FOIL PRINTS $9.99 Time Remaining: 4d 13h 13m Buy It Now for only: $9.99 |
 Vintage 1977 Charles CM Russell Embossed Gold Foil Two Print Set FREE SHIPPING $8.99 Time Remaining: 3d 21h Buy It Now for only: $8.99 |
 Framed Gold Foil Print by Lionel Barrymore Little Boatyard Venice 1950s $13.59 Time Remaining: 23d 13h 54m Buy It Now for only: $13.59 |
 Two Vintage Embossed Gold Foil Metal Tin Art Deco Pictures Mothers Angels Child $44.99 Time Remaining: 3d 22h 2m |
 Fine art print roman women dancing antique gold foil richard franklin oversize $24.99 Time Remaining: 28d 2h 28m Buy It Now for only: $24.99 |
 Framed Gold Foil Print by Lionel Barrymore Old Red Bank 1950s Boats Worker $13.59 Time Remaining: 23d 13h 54m Buy It Now for only: $13.59 |
 Vintage Frederic Remington Embossed Gold Foil Print Set $8.99 Time Remaining: 4d 19h 26m Buy It Now for only: $8.99 |
 NICKY BOEHME SIGNED COLOR FOIL ETCHING COUNTRY RETREAT PRINT GOLD TONE FRAMED $12.50 Time Remaining: 3d 21h 47m Buy It Now for only: $12.50 |
 SET OF 4 SIGNED LIONEL BARRYMORE FRAMED GOLD FOIL ETCHED PRINTS $68.88 Time Remaining: 17d 7h 22m Buy It Now for only: $68.88 |
 Frederick de Wit Gold Foil Map $17.99 Time Remaining: 13h 10m |
 set of two oversize Fine art prints architecture gold foil formal study estate $29.99 Time Remaining: 28d 2h 28m Buy It Now for only: $29.99 |
 Vintage 1970s Charles Russell A Bronc Twister Gold Foil Embossed Print $14.99 Time Remaining: 22d 20h 33m Buy It Now for only: $14.99 |
 LIONEL BARRYMORE ARTWORK Two Gold Foil Etchings $5.25 Time Remaining: 9d 7h 42m Buy It Now for only: $5.25 |
 Signed Lionel Barrymore Gold Foil Print Point Meyer Dry Dock Boat Workers $8.98 Time Remaining: 3d 23h 31m Buy It Now for only: $8.98 |
 SALE SET 4 FRAMED LIONEL BARRYMORE GOLD FOIL ETCHINGS GOLD ETCH PRINTS $30.00 Time Remaining: 2d 14h 27m Buy It Now for only: $54.95 |
 SET OF 4 UNFRAMED LIONEL BARRYMORE GOLD FOIL ETCH PRINTS WITH ALBUM $79.00 Time Remaining: 29d 11h 58m Buy It Now for only: $79.00 |
 FAILE SIGNED ART PRINT LIMITED EDITION GOLD FOIL SCREEN PRINT ED OF 50 FRAMED $2,100.00 Time Remaining: 4d 18h 57m Buy It Now for only: $2,100.00 |
 1929 Print Bull Statue Ur Gold Foil Lapis Lazuli Ancient Sumerian Culture Animal $44.95 Time Remaining: 28d 19h 4m Buy It Now for only: $44.95 |
 Angel 1 POSTER Gold Foil ART PRINT Religious Glory NEW $5.99 Time Remaining: 4d 15h 5m Buy It Now for only: $5.99 |
 Angel 2 POSTER Gold Foil ART PRINT Religious Glory NEW $5.99 Time Remaining: 5d 6h 5m Buy It Now for only: $5.99 |
 Set of 4 Lionel Barrymore Gold Foil Prints framed and in excellent condition $40.00 Time Remaining: 3d 16h 10m |
 Framed Gold Foil Print by Lionel Barrymore Old Boat Works 1950s Boats Worker $13.59 Time Remaining: 23d 13h 54m Buy It Now for only: $13.59 |
 SET OF 8 LIONEL BARRYMORE FRAMED GOLD FOIL ETCHINGS $399.99 Time Remaining: 5d 12h 56m Buy It Now for only: $399.99 |
 Signed Lionel Barrymore Gold Foil Print Purdys Basin Artist paints Habor Boats $8.98 Time Remaining: 3d 22h 55m Buy It Now for only: $8.98 |
 Signed Lionel Barrymore Gold Foil Print Titled San Pedro $8.98 Time Remaining: 3d 23h 23m Buy It Now for only: $8.98 |
 BY WYLAND WITH GOLD FOIL STAMP MINT CONDITION ABOVE AND BELOW $8.99 Time Remaining: 4d 20h 58m Buy It Now for only: $12.99 |
 3 Antique Prints Gold Foil Princess Charlotte Earl of Sussex Lady Marjoribanks $585.00 Time Remaining: 18d 18h 22m Buy It Now for only: $585.00 |
 MOSE PITT NOVA TOTIUS TERRARUM ORBIS GOLD FOIL MAP OF THE WORLD FRAMED Light OAK $79.99 Time Remaining: 15d 17h 4m Buy It Now for only: $79.99 |
 Fine art print roman women dancing antique gold foil richard franklin oversize $19.99 Time Remaining: 8d 6h 9m Buy It Now for only: $19.99 |
 Set of 4 Lionel Barrymore Gold Foil Etching $24.99 Time Remaining: 17d 21h 33m Buy It Now for only: $24.99 |
 Vertical Double Victorian Print Ladies w Gold Foil Inset Wall Frame Elegant $27.99 Time Remaining: 21d 22h 22m Buy It Now for only: $27.99 |
 VTG MID CENTURY MODERN 3D GOLD FOIL SILHOUETTE ANTIQUE TALL SHIP FRAMED WALL ART $24.99 Time Remaining: 3d 20h 50m |
 Anonymous Silver Antique Map Gold Foil $25.99 Time Remaining: 29d 23h 51m Buy It Now for only: $25.99 |
 Trevor Scobie Liquid Gold Foil Art Print Poster 16x20 $12.99 Time Remaining: 3d 18h 35m Buy It Now for only: $12.99 |
 9x7 Vintage Victorian Reflective Gold Foil Etching Picture in Gold Wood Frame $24.99 Time Remaining: 24d 12h 28m Buy It Now for only: $24.99 |
 BEAUTIFUL VINTAGE GOLD BLACK FOILED ART PRINT HAY BALES CURRIER IVES $24.99 Time Remaining: 2d 22h 19m Buy It Now for only: $24.99 |
 Contemporary Oil Painting on Canvas Autumn Leaves with Gold Foil $14.99 Time Remaining: 3d 22h 29m Buy It Now for only: $14.99 |
 BY WYLAND WITH GOLD FOIL STAMP MINT CONDITION LIVING REEF $8.99 Time Remaining: 4d 20h 52m Buy It Now for only: $11.99 |
 Gold Foil Picture HOME PORT by Lionel Barrymore $15.00 Time Remaining: 13d 6h 26m Buy It Now for only: $15.00 |
 Pair of signed Japanese gold foil paintings $129.00 Time Remaining: 4d 15h 47m Buy It Now for only: $129.00 |
 Vintage Rare Copper Gold Foil Jesus Last Supper Disciples 3x9 Christmas Card $9.99 Time Remaining: 21d 10h 16m Buy It Now for only: $9.99 |
 Lionel Barrymore Gold Foil Etching Courtyard Venice 4 $9.99 Time Remaining: 7d 21h 28m Buy It Now for only: $9.99 |
 BY WYLAND WITH GOLD FOIL STAMP MINT CONDITION DOLPHINS $8.99 Time Remaining: 4d 20h 55m Buy It Now for only: $10.49 |
 Lionel Barrymore Framed Gold Foil Etchings Set of 4 $79.95 Time Remaining: 9d 10h 7m Buy It Now for only: $79.95 |
 Gustav Klimt 3 Ages of woman Gold Foil $23.99 Time Remaining: 27d 23h 44m Buy It Now for only: $23.99 |
 THREE GOLD FOIL PICTURES OF PISA ITALY FRAMED AND READY TO HANG $17.09 Time Remaining: 29d 10h 59m Buy It Now for only: $17.09 |
 SET OF 5 FRAMED + 2 UNFRAMED LIONEL BARRYMORE GOLD FOIL ETCH PRINTS $89.00 Time Remaining: 29d 11h 47m Buy It Now for only: $89.00 |
 Moser Pursuit of Illusions Serigraph with Gold Foil Stamping Signed Art $450.00 Time Remaining: 27d 10h 42m Buy It Now for only: $450.00 |
 VINTAGE LIONEL BARRYMORE GOLD FOIL ETCHED PRINTS FISHING BANKS AND SEAWORTHY $24.99 Time Remaining: 3d 18h 43m |
 R H Palenske Collection of Gold Etched Foil Prints from Brown Biglow120401094 $39.98 Time Remaining: 13d 9h 23m Buy It Now for only: $39.98 |
 ART Pure Gold Foil Z Zeduan CHINESE SYMPHONIC PICTURE RIVERSIDE SCENE QUINMING $299.95 Time Remaining: 8d 10h 50m Buy It Now for only: $299.95 |
 USS Bon Homme Richard CVA 31 Gold Foil Print 8x105 $24.99 Time Remaining: 21d 10h 16m Buy It Now for only: $24.99 |
 Lionel Barrymore Gold Foil Little Boatyard Venice 3 $11.99 Time Remaining: 7d 21h 28m Buy It Now for only: $11.99 |
 WYLAND WITH GOLD FOIL STAMP MINT CONDITION AUMAKUA THE ANCIENT VOYAGERS $8.99 Time Remaining: 4d 21h 3m Buy It Now for only: $10.99 |
 Lionel Barrymore Gold Foil Little Boatyard Venice 2 $9.99 Time Remaining: 7d 21h 28m Buy It Now for only: $9.99 |
 Nova Totivs Terrarvm Orbis Gold Foil Map of The World Framed Wood BEAUTIFUL $40.00 Time Remaining: 21d 23h 58m Buy It Now for only: $40.00 |
 1697 Weigel Book of Trades Print GOLD SILVER FOIL PRODUCTION Flittergold Shop $39.99 Time Remaining: 18d 16h 45m Buy It Now for only: $39.99 |
 Tom DuBois JESUS Giclee on Paper Gold Foil CERTIFIED $359.99 Time Remaining: 5d 16h 59m Buy It Now for only: $359.99 |
 ART PRINT Iris Gold Foil Robert Charon $23.95 Time Remaining: 5d 20h 11m Buy It Now for only: $23.95 |
 Matted Framed Bird Flower Dogwood Print on Gold Foil 12x15 William Whiteside $9.99 Time Remaining: 4d 18h 21m |
 ART PRINT Poppy Gold Foil Robert Charon $23.95 Time Remaining: 5d 20h 11m Buy It Now for only: $23.95 |
 Haas Lilienthal House San Francisco Paul M Breeden Framed Gold Foil Etching $195.00 Time Remaining: 29d 21h 27m Buy It Now for only: $195.00 |
 GOLD FOIL NOVATOTIUS TERRANUM ORBIS MAP OF THE WORLD $16.95 Time Remaining: 24d 18h 51m Buy It Now for only: $16.95 |
 Guardian Angel of Marriage 9 x 12 print with gold foil $10.00 Time Remaining: 6d 14h 47m Buy It Now for only: $10.00 |
 Framed Gold Foil Etching of Castle $19.99 Time Remaining: 2d 12h 30m |
 ART PRINT Moon Dreams gold foil stamped Marta Wiley $29.99 Time Remaining: 21d 10h 6m Buy It Now for only: $29.99 |
 25x25 Red Vase gold foil stamped by Gillette Framed Art Print $126.00 Time Remaining: 22d 18h 33m Buy It Now for only: $126.00 |
 25x25 Green Vase gold foil stamped by Gillette Framed Art Print $126.00 Time Remaining: 22d 18h 33m Buy It Now for only: $126.00 |
 25x25 Eggplant Vase gold foil stamped by Gillette Framed Art Print $126.00 Time Remaining: 22d 18h 33m Buy It Now for only: $126.00 |
 Paul M Breeden Butterfly Gold Foil Etching Wood Framed Matted Print Wall Art $300.00 Time Remaining: 5d 23h 25m Buy It Now for only: $300.00 |
 Set of Three Lionel Barrymore Gold Foiled Prints Framed by Gallery $24.99 Time Remaining: 3d 21h 38m |
 STUNNING 3 D GOLD FOIL ROSE WALL ART by ORCHIDS GOLD SILVER CO 24X68 CM $110.00 Time Remaining: 23d 11h 26m Buy It Now for only: $110.00 |
 Nova Totius Terrarum Orbis Geographica Gold Foil Map of World Framed Wood 1681 $40.00 Time Remaining: 22d 12h 36m Buy It Now for only: $40.00 |
 Moser EVE 1986 Print Serigraph with Gold Foil Stamping Signed Original Art $500.00 Time Remaining: 27d 10h 42m Buy It Now for only: $500.00 |
 EDNA HIBELVILLAGE COUPLELTD ED SERI GOLD FOIL S COA $39.99 Time Remaining: 2d 9h 27m Buy It Now for only: $39.99 |
 VTG 18th C REVERSE FOIL OIL PAINTING GOLD GILT GESSO WOOD GLASS FRAME ca 1700s $299.00 Time Remaining: 6d 20h 52m |
 Mahayana Bodhisattva i Foiled in gold i $44.99 Time Remaining: 26d 18h 58m Buy It Now for only: $44.99 |
 CARLSBAD CALIFORNIA MINERAL WELL ON CARLSBAD BLVD HIGHWAY 101 IN GOLD FOIL $11.99 Time Remaining: 1d 23h 1m Buy It Now for only: $11.99 |
 J Karam Regatta 87 Gold Foil Sailing Magical Framed Art Sculpture Signed Sail $195.00 Time Remaining: 20d 57m Buy It Now for only: $195.00 |
 Sea Waif gold foil Jean Roy Hardelin 24x30 Art Print Poster $40.00 Time Remaining: 15d 20h 5m Buy It Now for only: $40.00 |
 Liz Jardine Gilded Cage I gold foil stamped $25.99 Time Remaining: 3d 21h 51m Buy It Now for only: $25.99 |
 By Wyland With Gold Foil Stamp $24.99 (1 Bid) Time Remaining: 2d 13h 26m |
 25x31 Sea Waif 24 x 30 gold foil by Jean Roy Hardelin Framed Art Print $136.00 Time Remaining: 3d 18h 31m Buy It Now for only: $136.00 |
 Sea Waif gold foil Jean Roy Hardelin 24x30 Art Print Poster $40.30 Time Remaining: 21d 17h 59m Buy It Now for only: $40.30 |
 Lionel Barrymore Gold Foil San Pedro 1 $11.99 Time Remaining: 7d 21h 28m Buy It Now for only: $11.99 |
 Jonathan Parsons Construct II Gold Foil $30.99 Time Remaining: 24d 19h 57m Buy It Now for only: $30.99 |
Gold Foil
Value Of Rarity And Beauty Of Gold
Gold has been called the most beautiful of all chemical elements. Its beauty has made it desirable for use in jewelry, coins, and artwork for thousands of years. It was one of the first pure metals to be used by humans. Gold is one of the few elements that can affect politics and economics. Wars have been fought over access to gold. Cities and towns have sprung up and died out as gold was discovered and then mined out. Many nations still count their wealth according to the amount of gold they keep in storage.
Gold lies in the middle of the periodic table. It is a heavy metal in a class known as the transition metals. Gold is also known as a precious metal (as are platinum and silver). Large amounts of gold are still used in the manufacture of coins, medals, jewelry, and art. Gold also has a number of uses in industry, medicine, and other applications. For example, one radioactive isotope of gold is commonly used to treat cancer. The chemical symbol for gold, Au comes from the Latin word for gold, aurum which means "shining dawn."
Gold objects dating to 2600 B.C. have been found. They were discovered in the royal tombs of the ancient civilization of Ur. These objects showed that humans had already learned how to work with gold this early in history. Some of the gold, for example, had been formed into wires. One of the special skills developed by the Egyptians was the adding of gold to glass objects. They found a way to use gold to make glass a beautiful ruby-red color. The glass became known as gold ruby glass.
Gold is also mentioned in a number of places in the Bible. A passage in Exodus, for example, refers to the clothing worn by Aaron: "And they did beat the gold into thin plates, and cut it into wires, to work it in the blue, and in the purple, and in the scarlet, and in the fine linen, with cunning work." Writings from every stage of human history tell of the discovery and use of gold. Roman historian Pliny the Elder (A.D. 23-79), for example, describes gold-mining locations. The Romans found it lying in stream beds in the Tagus River in Spain, the Po River in Italy, the Hebrus River in Thracia (now Greece), the Pactolus River in Asia Minor (now Turkey), and the Ganges River in India.
One of the most famous items using gold is the Olympic gold medal. Athletes from around the world dream of coming in first place at the Olympics. That means they can step up to the winner's podium and wear their gold medal proudly. But the gold medal isn't solid gold. It's actually made out of silver. A thin layer of gold covers the silver. The last time a solid gold medal was used in the Olympics was 1912. Christopher Columbus found gold nuggets lying in the bottom of rivers and harbors in Haiti. Gold has long been known in the New World, too. During a visit to Haiti, Christopher Columbus (1451-1506) found gold nuggets lying on the bottom of rivers and harbors. A Portuguese explorer in 1586, Lopez Vaz, wrote that the region called Veragua (now Panama) was the "richest Land of Gold [in] all the rest of the Indies." In the United States, of course, the most famous story about gold occurred in the late 1840s. Thousands of people flocked to California in search of gold. This era was called the Gold Rush. People became very rich or found nothing at all during this exciting time in history.
Gold is both ductile and malleable. Ductile means it can be drawn into thin wires. Malleable means capable of being hammered into thin sheets. A piece of gold weighing only 20 grams (slightly less than an ounce) can be hammered into a sheet that will cover more than 6 square meters (68 square feet). The sheet will be only 0.00025 centimeters (one ten-thousandth of an inch) thick. Gold foil of this thickness is often used to make the lettering on window signs. Gold is quite soft. It can usually be scratched by a penny. Its melting point is 1,064.76°C (1,948.57°F) and its boiling point is about 2,700°C (4,900°F). Its density is 19.3 grams per cubic centimeter. Two other important properties are its reflectivity and lack of electrical resistance. Both heat and light reflect off gold very well. But an electric current passes through gold very easily.
Generally speaking, gold is not very reactive. It does not combine with oxygen or dissolve in most acids. It does not react with halogens, such as chlorine or bromine, very easily. These chemical properties also account for some important uses of gold. Gold coins, for example, do not corrode (rust) or tarnish very easily. Neither does jewelry nor artwork made of gold.
Gold occurs in nature in both its native state and in compounds. The native state of an element is its free state. It is not combined with any other element. The most common compounds of gold are the tellurides. A telluride is a compound of the element tellurium and one or more other elements. For example, the mineral calavarite is mostly gold telluride (AuTe2). At one time, gold was found in chunks or nuggets large enough to see. People mined gold by picking it out of streams and rivers. In fact, gold was once very common in some parts of the world. People valued it not because it was rare, but because it was so beautiful.
The abundance of gold in the Earth's crust is estimated to be about 0.005 parts per million. That makes it one of the ten rarest elements in the Earth's crust. Gold is thought to be much more common in the oceans. Some people believe as much as 70 million tons of gold are dissolved in seawater. They also think there may be another 10 billion tons on the bottom of the oceans. So far, however, no one has found a way to mine this gold. About a quarter of the world's gold comes from South Africa. Other leading producers of the metal are the United States, Australia, Canada, China, and Russia. In the United States, about two-thirds of its gold is mined in Nevada. California, Montana, Alaska, and South Dakota also produce gold.
The most famous story about gold in the United States might be the Gold Rush of 1849. As early as the sixteenth century, records contained stories about a great El Dorado ("the gilded one," in Spanish; gilded means "covered in gold") on the western coast of the United States. Tales of this magical city were repeated for centuries.
In the late 1840s, explorers began to travel from the Eastern seaboard to California in search of El Dorado. The flow of visitors was slow at first. Gold was first discovered in 1848 at a place called Sutter's Mill. Sutter's Mill was located near the present town of Coloma, California. Word of the discovery spread quickly. Within a year, thousands of men and women made the long, expensive, and tiring trip. Most people traveled across the United States in covered wagons or on horseback. Many of them had to cross mountains, plains, and deserts. Because of the difficult conditions, many people and animals got sick or died. Some people traveled around Cape Horn at the bottom of South America or across the Isthmus of Panama. No matter which route was used, the journey usually took months.
As people arrived in California, hundreds of mining camps sprang up. Some of them had colorful names. Poker Flat, Hangtown, Red Dog, Hell's Delight, and Whiskey Bar were just a few! Mining for gold was hard work. Gold miners usually wound up being wildly successful or terrible failures. The Gold Rush of 1849 completely changed the state of California. It also helped expand the United States. At one time, gold was found in chunks or nuggets large enough to see. There is only one naturally occurring isotope of gold, gold-197. About two dozen radioactive isotopes of gold are known also. One radioactive isotope of gold is widely used in medicine, gold-198. This isotope has two major uses. First, it can be used to study the liver. It is made into a form known as colloidal gold. Colloidal gold consists of very fine particles of gold mixed in a liquid solution. The colloidal gold is injected into the patient's body, where it travels to the liver. There, it can be detected because of the radiation it gives off. The radiation can be used to tell if the liver is functioning normally or not.
In a 1986 study, experts estimated that 121,000 tons of gold had been mined throughout history. Colloidal gold is also used to treat medical problems. In some forms of cancer, the body develops large amounts of liquid in the space around the stomach and intestines (the peritoneum). One way to treat this collection of liquid is with colloidal gold. The colloidal gold is injected into the peritoneum. It is not able to Leave the peritoneum and go into the stomach and intestines. While in the peritoneum, the colloidal gold gives off radiation. The radiation kills cancer cells that cause the accumulation of fluid.
There are at least two main ways to remove gold from its ores. One is to mix an ore with mercury metal. Mercury combines with gold in the ore to form an amalgam. An amalgam is a mixture of two or more metals, one of which is mercury. The gold amalgam is then removed from the ore. It is heated to drive off the mercury. Pure gold remains.
Which weighs more: A pound of feathers or a pound of gold? Teachers sometimes try to fool students with this old question. The answer would seem to be easy: a pound is a pound. A pound of feathers and a pound of gold should weigh the same amount. But that is not quite true. In the English system, most substances are measured using the avoirdupois system. In the avoirdupois system, there are 16 ounces to the pound.
But gold is weighed differently. It uses the troy system. In the troy system, one pound contains only 12 ounces. So, a pound of feathers (avoirdupois system) weighs four ounces more than a pound of gold (troy system). The weight of other precious metals, like silver and platinum, are also measured using the troy system. Gold is also weighed in carats. A carat is defined as one fifth of a gram, or 200 milligrams.
Gold is seldom used in a pure form. The metal is too soft. It would bend or break if used pure. Instead, it is used in combination with other metals called alloys. An alloy is a mixture of two or more metals. The mixture has properties different from those of the individual metals. The amount of gold in an alloy is expressed in carats. Pure gold metal (mixed with no other metal) is said to be 24-carat gold. An alloy that contains 20 parts of gold and 4 parts of silver is 20-carat gold. The "20-carat" designation means the alloy contains 20 parts of gold and 4 parts of something else (silver, in this case).
Gold stored in a national bank can be 24-carat gold. It is never used for any practical purpose. But gold used for any real application is almost always less than 24 carats. It must include other metals that make it stronger and tougher. Gold ores can also be treated with potassium cyanide (KCN) or some other kind of cyanide. The gold combines with the cyanide to form a new compound, gold cyanate. The gold cyanate is then treated with an active metal, such as zinc. The active metal replaces gold in the compound, leaving pure gold.
In a 1986 study, experts estimated that 121,000 tons of gold had been mined throughout history. Of that amount, about 18,000 tons were used for industrial, research, health, and other "dissipative" uses. Dissipative means that the gold was gone once it was used. It was made into devices that were eventually thrown away. The gold could not or was not recovered from the devices. Of the remaining 103,000 tons of gold, about a third (35,000 tons) had been made into gold bars held by national banks. The gold bars are used as security for national money systems. In the United States, for example, the nation's supply of gold is stored at Fort Knox, Kentucky.
Finally, the remaining 68,000 tons of gold are owned by private individuals. This gold exists in the form of jewelry, coins, or bullion. Gold bullion are bars or other large pieces of pure gold. Jewelry is the largest single use of gold. In 1996, about 3,290 tons of gold were made worldwide. Of that amount, nearly 85 percent was made into jewelry. The second largest use of gold (about 213 tons, or about 7 percent) was in industrial devices and consumer products. Some examples include electrical contacts and switches, laboratory equipment, printed circuits, dental alloys, instruments on space vehicles, and nozzles used in the production of synthetic fibers. Gold is not required to maintain good health in plants or animals. It can be injected into a plant or animal without causing harmful effects. Some medical and commercial uses are based on this property.
About the Author
Dr. Badruddin Khan teaches Chemistry in the University of Kashmir, Srinagar, India.
What does an x-ray beam striking a thin gold foil cause?
a. the increase of atomic number target atom
b. the electrons to leave the golf foil
c. the formation of unstable
d. none of the above
B is the ans
the reason is photo-electric effect
gud luck
Gold foil