everyday chemistry

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Cleaning Coins, Metallurgy, Wet Chemistry

You want to use some sort of organic solvent to loosen the glue, then very gently rub the residue off. You don’t want to use any sort of silverware polish or anything abrasive when rubbing the coin. Good solvents might be olive oil or nail polish remover.

topic Refining silver from smithing. A discussion started in but continuing through Q. I do lost wax casting and smithing. I refine gold with nitric acid at home, by mixing scrap gold of different karat with copper and then dissolving it in slightly hot nitric acid.

Silver, being a relatively inert metal, does not dissolve in hydrochloric or sulfuric acid. Even if it did, it would form the insoluble silver chloride or the slightly soluble silver sulfate. Here are some of my experiences with dissolving silver. Silver is insoluble in aqua regia because of the presence of chloride. This is the best solvent for silver metal. Silver dissolves easily in nitric acid, releasing nitrogen dioxide fumes and forming a colorless solution of silver nitrate.

Here is a video by NurdRage on YouTube demonstrating the process.

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Claims 7 Having thus described my invention, what I claim as new and useful and desire to secure by letters patent is: A composition as defined in claim 1 in which 0. A composition as defined in claim 2 in which one or both acids and their concentrations in solution are formed from their respective anhydrides P2 O5 and N2 O5 and water.

A composition as defined in claim 1 wherein the optimum formulation comprises A process for the removal of stains, corrosion and encrustations from coins without attack on the substrate metal comprising applying to the surface of the coins a nitric-phosphoric acid composition formed by dissolving about 1.

Nic-A-Date Will Bring Back Worn Or Faded Dates On Nickels. If you can’t read the date, use Nic-A-Date to bring back the date so you can read it again.

Because of its comparative scarcity, brilliant white colour, malleability, ductility , and resistance to atmospheric oxidation, silver has long been used in the manufacture of coins , ornaments, and jewelry. Silver has the highest known electrical and thermal conductivity of all metals and is used in fabricating printed electrical circuits and as a vapour-deposited coating for electronic conductors; it is also alloyed with such elements as nickel or palladium for use in electrical contacts.

Silver also finds use as a catalyst for its unique ability to convert ethylene to ethylene oxide, which is a precursor of many organic compounds. Silver is one of the noblest—that is, least chemically reactive—of the transition elements. Silver tea caddy with maker’s mark C. Silver ornaments and decorations have been found in royal tombs dating back as far as bce. It is probable that both gold and silver were used as money by bce in all countries between the Indus and the Nile.

Alexander the GreatAlexander the Great as Zeus Ammon on a silver tetradrachm of Lysimachus, — bce, thought to be a copy of a portrait by Lysippus; in the British Museum. Reproduced with permission of the trustees of the British Museum; photograph, Ray Gardner for The Hamlyn Publishing Group Limited Silver is widely distributed in nature, but the total amount is quite small when compared with other metals; the metal constitutes 0.

Practically all sulfides of lead , copper, and zinc contain some silver. Silver-bearing ores may contain amounts of silver from a trace to several thousand troy ounces per avoirdupois ton, or about 10 percent. Unlike gold, silver is present in many naturally occurring minerals.

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Englishmate Villagers throng river to collect silver coins dating back to early s The silver coins were found near the banks of the river and they are believed to belong to the years between and Jun 19, The silver coins, with a photo of King George, were found near the banks of the river and they are believed to belong to the years between and As news spread, villagers from Malaheda, Hingauta, Khanpur and Bachhren reached the river to collect coins.

Nearly 50 coins were collected by the villagers who went to the river with digging instruments. Bharatpur district collector Narendra Kumar Gupta said officials have been asked to enquire into the matter.

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WonderHowTo One of the most famous and repeated chemistry experiments involves money. Some would say this is more of a trick than an experiment, but you can be the judge of that. No one can just turn pennies into silver or gold coins, but someone with a few chemicals can. So, if you want to cooler cents in your pocket, try out this chemistry trick yourself. Lithium shows you how to turn pennies into silver and gold coins using zinc. First, get 30g of zinc sulfate and dissolve it into mL of water.

If you don’t have zinc sulfate or can’t make it, you can also use zinc chloride. This can be made by simply mixing hydrochloric acid with zinc metal and waiting until the fizzing stops. Then, drop in several cut strips of zinc metal. The solution is heated to a boil and copper pennies that have been thoroughly washed and cleaned are dropped in.

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How can you recover the serial number of a gun if it has worn off? Stamped serial numbers cause deformation of the metal deep below the surface and can be read even when filed off. Something that coin collectors use to recover worn off markings on coins is a chemical called Nicodate that could be used on nickles. It might be worth a try.. A forensic expert mig…ht use acid etching or various scans to recover the number, but that kind of service will likely be expensive.

Colorful Coins Change the color of those dimes or nickels you have using a simple chemical reaction. If you’ve ever needed to clean a coin like a nickel or a dime, you might have used vinegar.

Wear goggles and disposable gloves. Any remaining finely powdered zinc should not be left to dry because it can ignite spontaneously. Dispose of it by rinsing with water, dissolving in excess dilute sulfuric acid and washing the resulting zinc sulfate solution down the sink. If a Bunsen burner is to be used then it should be turned off before the zinc is added. Strictly speaking it is illegal to “deface coins of the realm”, so the law-abiding teacher might prefer to use foreign coins instead.

It would be wise under these circumstances to ensure that the plating works, since many other alloys are used in foreign coinage. The solution will fizz as some of the zinc dissolves forming sodium zincate and giving off hydrogen. The Demonstration a Drop the cleaned coin into the hot solution containing sodium zincate and the remaining zinc powder. If necessary use a glass rod to move the coin until this is so. This will take about minutes.

Leaving the coin too long may cause lumps of zinc to stick to it. Turn the coin so that both sides are heated equally. Overheating will cause the coin to tarnish.

Silver, Chemical Element

Too Cleaning some old coins can diminish or destroy their value, however. If the coins are worth no more than their face value and are truly yucky, vinegar is one of the fastest ways to bring back the shine. Copper Distilled white vinegar, that housecleaning standard, will strip away the tarnish or patina that copper coins acquire with time and use. Mix half a cup of vinegar with a teaspoon of salt and drop in the pennies.

They will lose their dullness and brown color and look newly minted very quickly. Silver Silver coins tarnished to black can also be cleaned with vinegar or any other mild acid, including lemon juice, Coca-Cola, hot sauce and ketchup — even sour milk.

Given the size of a coin (~4cm) and the difference of resistivity between silver and copper of Ohms per metre, the expected difference in resistance between a 4cm copper coin and a 4cm silver coin would be about Ohms.

Do banks buy silver coins? No, banks do not usually buy silver coins. However, you can alwaysgo to a silver and gold dealer and exchange your precious metalsfor hard cash there. You have four silver coins with georgivs V dei gra rex et ind imp around the edge the largest is 25 on the back and the smaller ones say 10 all are very worn and you cannot make out a date or country? Most countries in the Empire, including the U. If so, that would mean they are from Canada. That’s also consistent with the date and country being worn off because Canadian coins of that era had design problems that resulted in excessive wear.

The reason it isn’t worn is that it isn’t a Morgan dollar from the 19th century. In fact, technically it isn’t even a coin – it’s a modern bullion piece or “round” sold for its metal value. Could i buy something with a Silver American Eagle Coin? American Eagle coins are bullion coins, which means they are not intended for use as circulating currency and have no fixed value.

Their value is determined by the current price of the metal they contain in this case, silver. As a non-circulating coin, no one is obliged to accept the American Eagle as legal tender, which is the case for coin or paper currency. However, the bullion coins are very valuable and it is quite possible to arrange a barter transaction with American Eagles so long as you can find a supplier willing to trade something for them..

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I haven’t tried it on silver yet. There is a product you can buy at some grocery store’s for cleaning the lime and scale out of electric coffee maker’s that will clean Clad and Nickel coin’s like new without the scrubbing that will damage the coin, Just be sure to rinse it well with soap and water, Then follow that with a rinse of Isopropyl Alcohol or Acetone based nail polish remover.

As for my thot’s on silver, I wonder if you could place a magnet with a sheet of paper over it and place the coin on top of it, and lay another paper over the coin and sprinkle some iron powder or Filing’s and see it the magnetic field passing thru the coin would give you an outline of the date and other feature’s? I do know that the coin’s once struck will have a different density where the date, legend, and portrait are.

That is how some law enforcement agencie’s are able to find serial number’s.

The acid will destroy anycollectible value the coin might have had IF the date werevisible, but dateless nickels are considered culls with a maximumvalue of 10 to 25 cents anyway.

Silver is also used to make electrical equipment, mirrors, medical and dental equipment, and jewelry. It is often used to make alloys with gold for some of these applications. An alloy is made by melting and mixing two or more metals. The mixture has properties different from those of the individual metals. Discovery and naming Silver was probably first discovered after gold and copper.

Gold and copper often occur as free elements in nature. They have very distinctive colors, which made it easy for early humans to find these metals. Silver also occurs as a free metal, but much less often than gold or copper.

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Silver is a soft, white, lustrous transition metal, it has the highest electrical conductivity of any element and the highest thermal conductivity of any metal. Silver is one of the most valuable elements next to gold. Silver can be found in nature in silver ore, silver ore is a mixture of other metals including silver. Jewellery and silverware are traditionally made from sterling silver standard silver , an alloy of In the US, only an alloy consisting of at least Britannia silver is an alternative hallmark-quality standard containing

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Cleaning Silver Coins If silver coins get exposed to air they will get after some time a brown or even black oxidized layer. This is caused by the small amount of sulphur that air contains. By knowing this chemical reaction, we could all imagine that the only way to stop this process is preventing that the coin is surrounded by air. There are ways to seal it in or cover it with an acid free jelly but most collectors prefer to clean the coins. Because most coins are exposed to air cleaning will be necessary after some time.

The cleaning of silver coins can be done by different methods and on this page we like to present to you this specific information and how this can be done safely. Keep in mind that for some coins, like ancient roman coins it might be wise not to clean them totally as they look more authentic with a light ancient looking color change caused by this natural silver oxidation effect. Put the coin in a lemon acid bath for some hours to maximum one day depending on the thickness of the oxidation layer to be removed from the coin.

After this bath clean the coin carefully with soft brush, rinse it with water and dry it with soft paper. The effect of this method can be improved by putting some small iron nails in the lemon acid bath. This will improve the chemical reduction of the lemon acid bath and a faster cleaning of the silver coin will occur. If you use some small iron nails do not leave the silver coin longer in the lemon acid bath then 30 minutes maximum and use the procedure as described earlier.

If the silver coin you want to clean has only some small oxidation spots then you can clean them best with an acid fluid like warm vinegar or sour milk on a soft tissue or a raw potato cut in half and rub the coin with it.

Ping Test for Silver Coins & Bars