History Of Gold Best Prices! Gold

HISTORY OF GOLD continued

Methods To Test Old Gold, Silver & Platinum
EQUIPMENT: A black stone slab - testing needles for different karats and colors - a bottle of nitric acid a bottle of aqua regia - and a bottle each of diluted nitric acid and diluted aqua regia. This equipment is simple and inexpensive. Get the acids from a local chemist or jewelry supply house will sell you special bottles for the acids, the stone and testing needles.

FIRST STEP: File a deep notch in the piece to be tested and apply a drop of nitric acid. If the piece is plated gold and you have cut through the gold surface it will turn bright green. Some articles are plated over silver base, be aware, file deep to expose the white metal - the reaction will not be green but will be a pinkish cream. If the piece is solid gold but less than 10 karat there will be a slight reaction. If it is more than 10 karat there will be little or no reaction.

TO FIND THE KARAT: If the piece is solid, file a clean spot and rub the spot on the stone making a distinct mark. Because it makes a mark equally heavy with one of the test needles - the one nearest in karat and color to what you suppose the gold to be. If the piece has a karat marking, start with a needle of the same karat.

Apply acid to both markings at the same time. Use nitric acid for 10 karat or less and aqua regia for higher karats. Then watch the action of the acid, a dark color spreads over the marks. If the needle marking reacts sooner than the other, wipe the stone dry and retest with a higher karat needle. By trial, until you find a match in reactions, you can determine the karat. If the acid you use acts too quickly to observe accurately, use diluted acid which has a slower reaction.

THE ABOVE TESTING IS NOT RECOMMENDED AS IT CAN BECOME DANGEROUS!

Things To Look Out For In Testing Old Gold
Do not take too much for granted. Extra time in examining and testing will avoid mistakes which might otherwise wipe out your profit.

STAMPED KARATS: Do not depend altogether on the karat marking. Manufacturers are allowed a tolerance for variation by law. Test to make sure. Watch for higher karat plate on gold of lower karat.

SOLDER: Watch for it and make allowance in establishing the value. Soldered joints are usually 2 to 4 karats less than the article itself.

CHAINS: Some chains have considerable solder in them, especially fine chains with small links. Examine links carefully, some may be made of very heavy plate or plated on a silver base. Watch for repairs, a lower karat or plated links may have been substituted.

WATCH CASES or any article made of several parts - be sure to test each part separately. Sometimes the case size stamp is mistaken for the karat mark. Usually karat stamps include K or Kt.

REPAIRED ARTICLES: Sometimes rolled plate or lower karat gold is substituted in repairing.

ROLLED PLATE: Be sure to file a deep notch. Rolled plate has a value proportionate to the quality of the plate.

GREEN GOLD: Reacts more slowly to acids than yellow gold because of a high percentage of silver used in the alloy. Test with green gold needles.

WHITE GOLD: Reacts more slowly to acids because of nickel or palladium in the alloy. Test with white gold needles.

STAINLESS STEEL: And other white base metal compositions made into jewelry have been fraudulently stamped and sold as white gold. They weigh less by volume than gold and usually can be detected by the "fell of the weight". In filing, stainless steel is also much harder.


		HISTORY OF GOLD continued Methods To Test Old Gold, Silver & Platinum EQUIPMENT: A black stone slab - testing needles for different karats and colors - a bottle of nitric acid a bottle of aqua regia - and a bottle each of diluted nitric acid and diluted aqua regia. This equipment is simple and inexpensive. Get the acids from a local chemist or jewelry supply house will sell you special bottles for the acids, the stone and testing needles. FIRST STEP: File a deep notch in the piece to be tested and apply a drop of nitric acid. If the piece is plated gold and you have cut through the gold surface it will turn bright green. Some articles are plated over silver base, be aware, file deep to expose the white metal - the reaction will not be green but will be a pinkish cream. If the piece is solid gold but less than 10 karat there will be a slight reaction. If it is more than 10 karat there will be little or no reaction. TO FIND THE KARAT: If the piece is solid, file a clean spot and rub the spot on the stone making a distinct mark. Because it makes a mark equally heavy with one of the test needles - the one nearest in karat and color to what you suppose the gold to be. If the piece has a karat marking, start with a needle of the same karat. Apply acid to both markings at the same time. Use nitric acid for 10 karat or less and aqua regia for higher karats. Then watch the action of the acid, a dark color spreads over the marks. If the needle marking reacts sooner than the other, wipe the stone dry and retest with a higher karat needle. By trial, until you find a match in reactions, you can determine the karat. If the acid you use acts too quickly to observe accurately, use diluted acid which has a slower reaction. THE ABOVE TESTING IS NOT RECOMMENDED AS IT CAN BECOME DANGEROUS! Things To Look Out For In Testing Old Gold Do not take too much for granted. Extra time in examining and testing will avoid mistakes which might otherwise wipe out your profit. STAMPED KARATS: Do not depend altogether on the karat marking. Manufacturers are allowed a tolerance for variation by law. Test to make sure. Watch for higher karat plate on gold of lower karat. SOLDER: Watch for it and make allowance in establishing the value. Soldered joints are usually 2 to 4 karats less than the article itself. CHAINS: Some chains have considerable solder in them, especially fine chains with small links. Examine links carefully, some may be made of very heavy plate or plated on a silver base. Watch for repairs, a lower karat or plated links may have been substituted. WATCH CASES or any article made of several parts - be sure to test each part separately. Sometimes the case size stamp is mistaken for the karat mark. Usually karat stamps include K or Kt. REPAIRED ARTICLES: Sometimes rolled plate or lower karat gold is substituted in repairing. ROLLED PLATE: Be sure to file a deep notch. Rolled plate has a value proportionate to the quality of the plate. GREEN GOLD: Reacts more slowly to acids than yellow gold because of a high percentage of silver used in the alloy. Test with green gold needles. WHITE GOLD: Reacts more slowly to acids because of nickel or palladium in the alloy. Test with white gold needles. STAINLESS STEEL: And other white base metal compositions made into jewelry have been fraudulently stamped and sold as white gold. They weigh less by volume than gold and usually can be detected by the "fell of the weight". In filing, stainless steel is also much harder.









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