ageka

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

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

Oh but I like radiation How else would I read my old analogue watch in the dark ?

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

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

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 )

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

Close up of green spots Sovereign_1958_L_2_green3.BMP

I have three new gold sovereings Definition of new = 1957 and later All three have dozens of green spots on them I have no access to MS 70 what should I try ? The spots are only visible under 10X magnification

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

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

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

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

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

No your Saint has some slide but is otherwise very nice

ok so this is a coronet I have

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

Since there is no age limit I'll go with a three year old

I do not have a digital camera But some 10 years ago my brother gave me a mexican ashtray made out of copper coins

What the flash reveals is a mechanical cleaning I do not think the flash would show a chemical cleaning

Definitely not this one http://cgi.ebay.de/ws/eBayISAPI.dll?ViewIt...8316146560&rd=1

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. http://www.frenchlines.com/collections_en.php

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

Well I had to look up my records and in absolute terms the most expensive was a steal at 477 euro 100 FF Laurated

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