I want to clean my old coins with Sulfuric Powder any ideas on how to do that?
217381
Powder + Water + Rag = Clean Coins
447575
Skip the dry cleaning.  That's just unhealthy anyway.  Soak the pieces in baking soda, with hot water.  You can also soak them in vinegar, but not at the same time, since that could cause corrosion.  Make sure one is completely rinsed out before you do the next soak.\n\nIf that still doesn't work (though it should), just tell your friend that these pieces were damaged accidentally and exclude them.  Or  you can just tell her the truth.  She sounds like a good friend who would understand.
146535
Just look it up on Ebay or a similar coin.  If not, try coin books at a big public library.  If that doesn't work, try writing a letter to some coin dealers.
193372
Collecting coins?\nCleaning coins is a no-no.  Humans are crows and shiny is better.  All that glitters is gold. But the shine has to be there in the first place and not be enhanced.  Coins with their original finish are valuable because of the quality of their original striking, the lack of wear on them, and their eye appeal.  Attractively toned copper and silver coins are also desired by coin connoisseurs.\n\nPolishing the coins abrades and changes their surfaces, reducing their eye appeal and collectabilty.  Cleaning coins wears them down and lowers their grades.  It might be okay to shine a common date silver dollar as a keepsake.  It is highly likely that most old and ancient coins will have been cleaned.  We need to care for our coins, and protect them from cleaning, wear, and scratches.\n\nMany types of coin holders can cause problems as well.  Plastics sliding across coin surfaces may cause tiny scratches.  The plastics that cover coins may break down and turn the coins green, or coat them in goo.  Watch your collection for signs of trouble.  Store your coins in a box or album so that weight is not applied to them, and there are no extremes of temperature.  Fire safes and safety deposit boxes may cause condensation problems, which are even more dangerous to stamps and banknotes.  Put some silica gel, a dessicant that removes moisture from the air, in with your collectibles.\n\nBeware of whizzed, or overly polished coins.  If something looks too good to be true, it probably is.  Buy your coins from a trusted source, with a liberal return policy, or guarantee.  If you have, or are acquiring, coins valued at five hundred dollars or more, consider using a third-party grading service. I.C.C.S. is well respected for Canadian coins.  P.C.G.S. http://www.pcgs.com is universally accepted for American coins.  For a fee, coin experts who have no vested interest in the selling price will grade and encapsulate your coins.  This makes the coins more merchantable and protects buyers and sellers.  The holders are generally regarded as safe.  Some people feel that so-called slabbed coins lack a certain hold it in your hand appeal that raw coins have.\n\nA fiery red-toned copper cent, a flashing white silver dollar, and a rainbow-hued silver quarter, all dazzle collectors eyes.  Toning can also be enhanced, or used to hide defects.  With practice and patience, collectors can learn to see the beauty beneath the blackening on silver coins.\n\nConsult an experienced dealer, or collector friend, before reaching for the coin cleaner, and harming your holdings.  Likewise, if your coins have storage problems, help may be available.  Some chemicals can remove plastic pvcs, spotting, or oiling, without changing the coins metallic finish, or altering the surfaces.  Seek expert advice and use caution with potentially carcinogenic chemicals.
622658
You need a solution of gold sulfate or gold chloride to do it, but it has to be extremely pure, made with distilled/deionized water.  Remember to have your ring on the anion (the negative) and your gold source on the cation.
361378
Hydrogen peroxide can oxidize copper metal on the surface of the penny by displacing it as copper(II) ions.  See link for detail explanation.
471655
u should try coins and other metals, also try sponges and cloth and things that u are sure wont float.  u mite be suprised with what u discover.
407512
take it to your local hazardis waste material center, they should know what to do with it:)
250053
Use lighter fluid on a paper towel, and wipe it off, the spray it with windex and wahlah, clean picture frame!
414699
use old cardboard boxes and some spray paint
361740
You can get putty like ones from art shops that remove dark HB and pretty much destroy anything apart from the pressure on the paper. they need to be cleaned a lot but can be molded to an easy shape and are dabbed rather than rubbed which means less white flakes and little paper ripping.
611816
No safe way to do it.  Distillation perhaps, but that's not safe as sulphate fumes are not that good for you.  \n\nGrab the stock bottle and make up a fresh solution.
572846
Not quite they answer to the question, but, I used to work with a gold process. We used to recover gold as gold sulphide precipitate, by making alkaline, then adding sodium hydrosulphite. The sulphide was then sent to a refinery company, to recover the gold.
476292
You could bottle it and sell it on ebay to New Age people.  Many receipes and treatments call for rain water, and it seems you have some "vintage" rain water.
95005
Throw your change in them. When your old, you'll have enough to retire :)\n\nOr you could sell them on Ebay :)
520825
Return them to nature, bury, burn or make them an offering to a river or the sea. \nPeople buy old religious prints and statues on eBay but you can't know how they'll be treated or what they might be used for, if you don't really care about this you could make some extra dollars.
400989
Sometimes they are better.  There is a formula for cleaning grubby little brass items (screws, hinges, hooks, Meccano gears etcetera): mix 1 teaspoonful of cream of tartar with one and a half teaspoons of washing-up liquid and a little cold water, add half a pint of scalding water, add the metal items, stir for 60 to 90 seconds, drain and rinse.  This either leaves the items gleaming, or loosens their tarnish so much that a gentle scrub with cream cleanser leaves them gleaming.  Nothing commercial is anything like as good as this.