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Posts posted by ageka
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In the winter Belgium puts tons of table salt Sodiumchloride on the ice and snow
When the temperature goes lower this salt does not work any more and they swithc to Calciumchloride and put tons of it on the road so that my car often is covered in the stuff up to the complete roof
I am still cofused this stuff would absorb air moisture well
http://www.chemicalland21.com/arokorhi/ind...%20CHLORIDE.htm
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Oh but I like radiation
How else would I read my old analogue watch in the dark ?
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Silver coins can be Restored via Electrolysis.
Put some slightly salty water in a Stainless steel pot use a car battery and connect the + to the Coin and the - to the pot.
The current is supposed to remove the silver from the corrosion and plate it back on the coin.
I have never tried this so I don't know if it would work.
I have a friend who does this with old uncleaned roman coins
then you need bicarbonate or baking soda to stabilise the ph of
the mixture and even so you need to change the solution every
30 minutes
He uses a 220 volt AC converter to DC
Works very well
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I read two recipes that sound as if they would work
1) put the coin on aluminium paper and poor salted hot water over the lot
reverse corrosion will turn silversulfide back to silver
2) put coin on aluminium and poor hot water with baking soda in it over the coin
same reaction
Since alu is less noble then silver it will oxidise and return the silver to the originale state
Actually putting a battery on the solution will work better but if you hoke up to the wrong anode/ kathode your coin will be completely pitted in a few moments
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Chlorine is about one of the only products that will eat stainless steel
by pitting corrosion
Means surface may look allright but you got pits right through the pipe or whatever
stainless container you have
If chlorine came free about the only thing you can do is wash and wash in the liquid of your preference ( distilled water eg )
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Thank you for the advise
One of the coins was MS62 like
the lowest rank of the three
So I dunked it in acetone and rubbed it with a surgical glove on
The green spots just rub off
So it must be a mono molecular layer of coppersulfate or copperchloride or whatever because the saltcolor on gold changes
like black silversulfide shows red etc
I am going to let the next one sit in acetone without touching for an hour
and see what happens
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Close up of green spots
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The only thing I know that becomes self igniting is white phosporus and pure sodium when put in water
Also sulphur in solutions may self ignite when the solvent dries out
Otherwise the word selfignating is abused
Unless you mean flamable at room temperature
If you put a match to strobander rum at room temperature it will burn
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The most cruel demo I had was at univ
Prof demo of surface tention
You put soap in a tub of water
Then put a duck in
The duck will sink , no surface tention to float it
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If you knew the composition of the powder you could do something specific
I only know about silica gel
How about putting the coins in distilled water should not damage them more then they are
If distilled water does not work try acetone
Boths should do no more damage then done allready
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This type of break is not metal fatigue nor is it plastic deformation
It looks like intergranular corrosion which you get at extremes of low temperature
or pressure or acid treatment
Very strange
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Allthough not fake I just read on ebay germany that german cities
partnered with japanese cities are issueing commem euro coins limited
to 500 sets and all but one series marketed in japan only
The going price is like 100 to 150 euro for a set of 3.88 euro
http://cgi.ebay.de/ws/eBayISAPI.dll?ViewItem&item=8317063723
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That i like!
Wipes the floor with my Saint.
No your Saint has some slide but is otherwise very nice
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Well i could post some hammered coins that i think are nice eye appeal wise but i'd be in a minority, since the designs are most just legends and no portraits or pictures.
However perhaps the only coin i have that might be able to partake in this with any success is this.
Which is alright but it ain't no $20 Lib.
Now you got me confused I thought this one was the Double Eagle Liberty and the older one was the Double Eagle Coronet ?
Anyway I prefer this one
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I do not have a digital camera
But some 10 years ago my brother gave me a mexican ashtray made out of copper coins
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What the flash reveals is a mechanical cleaning
I do not think the flash would show a chemical cleaning
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It is a medal token or badge from a ship out of le havre
COINS, MEDALS AND BADGES
It is tradition in many domains of activity to celebrate an event with the striking of a medal. This is the case in the Merchant Navy. The launching of a vessel was celebrated by presenting the important guests with a medal in souvenir of the memorable day. The memory of a president will be honoured in the same way. It is also a way of showing gratitude to a vessel and its crew for war and rescue duties.
Many other occasions are also honoured with this kind of ceremony. More commonplace is the sale of medals and badges to passengers during the life of the vessel.
Other collectors’ items are Assembly coins and seniority medals.
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My oldest is a Louis d'or
Louis XVI 1787
Only because the earlier ones are either very expensive or look like coins that have been folded in two
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I have restrikes but no copies
I might buy a copy if it was not a mini but the same size ,weight and material
as the original
omg horrible chemical spill... :(
in Coin Forum
Posted
Trantor I know about the rice in salt shakers
The larger rice will also mechanically shake loose lumpy salt
But I guess that only is necessary at 90% humidity
Since in my heated home the salt never gets wet
Since you can regenerate silica gel in the oven I do not
understand why calciumcloride would be intresting to use
With silica gel the color shows saturations with calciumchloride
I guess you would not even know when to replace it