| Author |
 Replies: 8 / Views: 1,304 |
|
|
Pillar of the Community
United States
974 Posts |
I had told a friend about removing organic crud using acetone from some of his coins. He tried it and rinsed it with distilled water then used a blow dryer on the "cool" setting. The crud is gone! However, he said that when you look some of the coins it is barely visible but you can see like a water spot as a result of this process along the rim. I told him he either didn't rinse it good enough or he didn't get the majority of the water off before he blew it dry. I was going to suggest he resoak it in acetone and this time ensure the majority of the water is gone before blow drying it...any thoughts about this advise before I give it to him?  Edited by Nelrak
10/18/2007 1:15 pm
|
|
|
|
Pillar of the Community
United States
6384 Posts |
Hi Nelrak,
If the acetone is good quality it should not be necessary to give a final rinse with water. Just use fresh acetone for that final rinse and place the coin on a clean paper towel. The acetone will rapidly evaporate and all traces should be gone within a couple minutes.
|
|
Pillar of the Community
United States
7123 Posts |
Hi Nelrak
What is the metal composition of the coin ?
If He is using pure acetone there is really no reason to rinse the coin ,,it evaporates with out a trace on its own .
I only recommend acetone for the Noble metals ,, just soak and then a few waves in the air holding the coin by the edges and the acetone is gone .
also one coin per measure of acetone do not do multiple coins with the same acetone ,,anything being removed is suspended in the acetone and can be re deposited on other coins.
In short if the coins are of noble metals then a re treatment will not hurt them any .
IMO
Metalman
|
|
Pillar of the Community
 United States
974 Posts |
These are mostly silver and copper coins. Supposedly the silver are showing the spots.
|
|
Bedrock of the Community
United States
20753 Posts |
Basically what has been said is true. Acetone will evaporate completely and leaves no traces except for what was absorbed from the coins. HOWEVER, remember that what ever the Acetone absorbed is now in the Acetone and if not rinsed with distilled water may leave some of the absorbed substance right back on the coin as the Acetone evaporates. The Acetone absorbed the foreign substance and if left to evaporate the substance will be left as a residue. This is why so many always say to rinse with distilled water and then blow dry the coin. Also why you should not reuse the same Acetone over again.
|
|
Pillar of the Community
United States
1952 Posts |
if he is using finger nail polish remover it will leave that residue as well. I tried that years ago because it said acetone on it. the polish remover is not pure acetone and will leave a film
Gary
|
|
Valued Member
United States
144 Posts |
Just rinse with a little fresh acetone after soaking to make sure there's no residue. I use acetone at work (and on coins) to remove water.
|
|
Bedrock of the Community
United States
17884 Posts |
[quote] I use acetone at work (and on coins) to remove water.]/quote]
I do the same thing. Remove the crud with acetone, rinse with distilled water to make sure all of the crud contaminated acetone is gone, and then a final rinse with fresh acetone to remove the water.
|
|
Bedrock of the Community
United States
20753 Posts |
Take a very clean glass dish. Pour some of your Acetone on it and allow to evaporate. If any residue at all, discard as contaminated. If purchased in a can, the inside of that can is coated to protect solutions from contaminations. The inside coating process is not infalable. If not done properly, manufacturing tolerances, some of the Acetone, sold in paint departments, could have already absorbed some materials. This is a normal acceptance due to no normal high grade usage is anticipated.
You should see the tolerance factors on canned foods and drinks.
|
| |
Replies: 8 / Views: 1,304 |
|
Posted 10/18/2007 2:04 pm
