Black Spots On Copper And Silver Coin

silviosi, to be honest something like that looks like it would fetch a larger premium if left untouched. I am a big fan of ancient relics and from my point of view it should have been left alone, the surface discolouration tells a story of its age and origin, and I'm sure it would be easier to date before it was cleaned, cleaning it ruins that story and dating it becomes harder regardless of the stamp.

No offence by any means when I say this, but that is probably why you were "lucky" because to me, it looks fake now.... I do however see your point, but cleaning coins is still cleaning coins and nobody wants that unless its a rare key date IMO and I don't think that will ever change, not in this life time anyway.

I will not clean I will ship the soap. If I will do my wife will kill me.

@John You have a big and objective point of view. At museum they test from all point of view, at least this is what they describe. Before you was not able to see exact the design, after I find to be a piece of art with empirics tools. Was also full of basement mud. I clean before bid the bottom from mud and ask my wife of the reading signs (is Chinese origins) and told me is something like lost language written and only few people can identified, so I bid and I was lucky for almost 1000$ CAN after border fees. I like those lost way to produce art. I can see in many parts the damage from the centuries of Verdi's, it 's ok and I like to look and appreciate the way how they do 'it. Close show clear was hammer done inclusive the approx. round of.

Oki everything on the vase was done at Ottawa Museum of Arts. I do not touch the vase in any kind, just make the glass cover and find the right stand. The traces we see are the original traces discovered after they do the cleaning. I have three pages of their report of the cleaning-preservation. The museums do like this, and I have others which they refused a cause of the danger to deteriorate. Maybe I will take photos and show which ones they refused.

Me I look for 100% non invasive treatment, even the drying is done by flow of air on suspended coin in cotton soft tissue, no hand touch without chirurgical gloves.

I believe that you are comparing apples to oranges......antiquities which have been buried, in fires and or are thousands of years old are cleaned as common place. Canadian coins lose value when cleaned....just my two nickles worth

Please remember this......A bunch of collectors I know will compare images of a previously seen/offered coin to one being offered for sale...............coins as you know have (most) bag marks etc that are unique. If an individual buys a spotted coin at an on-line auction then offers an example with no spots.....it will be outed as a cleaned coin. A LARGE dealer was caught upgrading notes same thing. Just two more nickles worth....

Yes, the first cleaning cost 475 plus taxes and 250 plus taxes for appraisal.

Me I pay for this because I like them (those artifacts) and I do not want to deteriorate more. Also because they are specialists on those artifacts. Maybe on the visions of many is lost value, but for me no because I like to look and admire the art.

They also repair me a picture from 1889 an Abbey the fonder of the first English art school in London and now I am happy with the work which they done.

Wade, sorry, yesterday I was busy.

the coins after strike are clean because the emollient use on dies could affect in long term. Second the NCS when preserve and clean the coins on the first step use soap and steam to take out all the dirt. This operation do not affect the coin, do not change the color or such. then after this operation they go to studies the different kind of tarnish or spots. If they are organic, they will clean and then certify and send to TPG, and the coin will come without CLEANED.

About the gold: The normal color of gold is yellow. After a time become more reddish and if somehow Cl or S come in contact become brown. just a worm bath with soft soap will clean.

How many times you use the vinegar which is acid and salt which is NaCl, or peroxide or acetone? This is OK? NO is very invasive cleaning.

Preserving the historical objects, do not mean lost in value or deteriorate. Museums do, TPG's do everybody do because we have the technology to do. Is not perfect now but will come. The old (like me) mentality of is a clean coin, no value is past. This was only an marketing and business tool.

Wide all my appreciation for you and your knowledge. I will never have this. at the next ANA when the time permit, Pet and Will will talk about. Sorry I can not disclosure theirs full names but I am sure you know them.