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 Cleaning coins / bank notes

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Market! Market!



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PostSubject: Cleaning coins / bank notes   Sat Jul 30, 2011 4:18 pm

What's the proper way to clean coins?
I chance upon this site - http://www.philippinecoins.com/.
I learned that cleaning coins will lower their value.

Any experts out there who can advise us on how to properly clean coins?
Vinegar? Acetone? Soap and water? Running water?
Is it safe to wipe them? Wet/Dry cloth.

How about bank notes?

Thanks!!
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ericgo

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PostSubject: Re: Cleaning coins / bank notes   Sat Jul 30, 2011 4:27 pm

typically the least harmful to coins is an acetone bath. (put acetone in a dish then place coin in dish) as much as possible, i wouldn't wipe the coins since it will cause small marks on the face of the coin.

i only put coins in an acetone bath if they show signs of pvc contamination. basically if the green stuff starts to form and harden, the value of the coin would be much much lower than one that has gone through an acetone bath or has been cleaned using other methods
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PostSubject: Re: Cleaning coins / bank notes   Sat Jul 30, 2011 4:33 pm

What about dusty coins? Got a lot of them last week from my grandma's glass jar.
Can I just put them under running water? (without wiping them)
Dry them by placing them on a cloth? (without wiping them)

Will they get damage if I leave them under the sun (to dry)?


I read somewhere on this forum about using vinegar? Any thoughts?
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ericgo

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PostSubject: Re: Cleaning coins / bank notes   Sat Jul 30, 2011 11:25 pm

yes running water and putting them on a cloth to dry should work well.

haven't tried vinegar before so im not sure what the effects of vinegar on coins would be
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PostSubject: Re: Cleaning coins / bank notes   Sun Jul 31, 2011 5:40 am

@Market! Market!
running tap water is fine, wag mo lang i-rub while washing, let the running water do its job, to dry naman, NEVER leave it under the sun, just use a smooth, non-abrasive towel or cloth and gently pat to dry, don't rub also

@ericgo
when using vinegar, add a little table salt (about 1 tsp. to 500ml ratio) to improve effect and avoid hazing in coin, but be wary not to leave too long because vinegar is still acidic and will eat away at the metal, this vinegar method works very well on copper, bronze and brass coins, little effect on nickel, zinc and steel coins, waste of time to use with silver because silver is non reactant

hope these help, use with extreme caution, have a nice day
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al.plata

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PostSubject: cleaning coins   Sun Jul 31, 2011 10:08 am

use of calamansi juice and vinegar is not recommended specially if you are forgetful like me.. it will destroy the coins if you soaked it for a long time.. this is from experience..
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PostSubject: Re: Cleaning coins / bank notes   Sun Jul 31, 2011 3:23 pm

Thanks for the replies!!!

So let's say I use tap water to clean out the dust.
How can I make the coins shiny?
Will acetone bath work?
If it does, how long should I leave it submerged?
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ericgo

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PostSubject: Re: Cleaning coins / bank notes   Sun Jul 31, 2011 3:50 pm

typically with acetone, a minute or two is enough.

if the coin was never cleaned before, the acetone should help in bringing out the shine of your coin
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PostSubject: Re: Cleaning coins / bank notes   Sun Jul 31, 2011 7:16 pm

eric hindi ba destructive ang acetone sa surface ng coin at hindi ba ito mahahalata under a magnifier?
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ericgo

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PostSubject: Re: Cleaning coins / bank notes   Sun Jul 31, 2011 7:25 pm

no sir. acetone does not damage the surface of the coin
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PostSubject: Re: Cleaning coins / bank notes   Sun Jul 31, 2011 10:26 pm

ericgo wrote:
no sir. acetone does not damage the surface of the coin


ohhhh that's nice.. thanks! cheers
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al.plata

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PostSubject: cleaning coins   Mon Aug 01, 2011 8:58 am

i also read that, acetone is the only cleaning solution for coins that are readily available and do not leave any mark on the coin surface.. it is used by recognized numismatist groups offering services in cleaning coins..
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PostSubject: Re: Cleaning coins / bank notes   Mon Aug 01, 2011 7:46 pm

Tonight, on my way home, I will buy one!

Very Happy

Tomorrow, will clean more coins from my grandma's glass jar.

So just 2 minutes?
What happens if I leave it for 10 minutes? An hour?

Will it corrode the metal? Will it make it shinier? hahaha LOL
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PostSubject: Re: Cleaning coins / bank notes   Mon Aug 01, 2011 8:34 pm

basically if the stuff on the surface doesn't come off after a 2 minute acetone bath, it won't come off anymore. so leaving the coin in for an hour, a day a week or a month won't help
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PostSubject: Re: Cleaning coins / bank notes   Mon Aug 01, 2011 10:08 pm

@ Market! Market!

Why do you want to clean your coins? Because it is dirty? or dusty? or you want to make it shiny as you have stated it here?
Quote :
How can I make the coins shiny?

My personal advice to you is just leave the coins as is. You don't want to removed by "accident" the dirt and patina that has accumulated all those years. Value will drastically goes down due to an improper and excessive cleaning of coins more so a shiny coin due to cleaning too.

Here's mine.. The first ever coin I have that started me to coin collecting. Bought this 12 years ago. No patina, no dirt and it is very shiny. Why? I cleaned it with a silver cleaner! I was also thinking then why this is not shiny like those new coins. So I cleaned it and nobody then was able to advice me not to do it.. Definitely, the value of this coin is way way down now. So I'm keeping this one not only for educational and historical purposes but also as a testament of my stupidity.. Hope you would learn from my experience..



We uses acetone for cleaning in most cases coins that has some pvc contamination. But if your coins was placed in a glass jar,
Quote :
Tomorrow, will clean more coins from my grandma's glass jar.
, I can't see why it is due to cleaning with acetone because there's no pvc contamination in a glass jar, and if this glass jar has cover on top, maybe some minimal dust/dirt that doesn't warrant an acetone cleaning.

Presently, I have 12 coins immersed in acetone for more than a week now. Trying to remove some tape residues. The acetone didn't affect the coins and the tape residues are still there. Will leave it there for another week before I gave up on this..

By the way, here's my pvc contanimated coins before and after the cleaning. It's been on my cheap National Bookstone coin album for 10 years. It's only recently I discovered these contamination. So I used acetone too. But maybe because it's been there for 10 years, the acetone was only able to removed 80% of it.. So you know what I did? I used a detergent bar to finish it! Not a very good advice but very handy when you're frustrated!



So if you're decided to take those coins out of the glass jar, use either a pvc-free coin album, coin capsule or 2x2 mylar coin holder for storage and to preserve the values of your coins..

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PostSubject: Re: Cleaning coins / bank notes   Mon Aug 01, 2011 10:56 pm

My coin album is PVC (I read here that it is if you can smell it).
I don't want to put my coins on a coin capsule since I won't be able to show it off. LOL

2x2 mylar coin holder? Is that those cardboard thing that you need to staple?
hmm... if that's the one then I can consider it.
I work near SM Megamall and WORLD TREASURES has a lot of those cardboards.

Currently, my coins are in those PVC albums. (I don't have expensive coins...yet LOL).
I will try to seal them in those cardboards.


More question:

1) Once I put them in those cardboards. Is it safe to put them back in the PVC album?
I can see collectors putting in those cardboards inside albums (not sure if theirs is PVC free).

2) What do you advise? Cotton gloves or latex (the ones they use at the hospital?) - for handling coins
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PostSubject: Re: Cleaning coins / bank notes   Tue Aug 02, 2011 12:27 am

Quote :
x2 mylar coin holder? Is that those cardboard thing that you need to staple?
hmm... if that's the one then I can consider it.
I work near SM Megamall and WORLD TREASURES has a lot of those cardboards.

yes that's the one.. well, if you will visit the World Treasures maybe you could share to us( specially to me Very Happy ) how much is the 2x2 mylar coin holder now and whether they have a website.. I'm from Mindanao and it's really hard buying these mylar holders here.

Quote :
1) Once I put them in those cardboards. Is it safe to put them back in the PVC album?
I can see collectors putting in those cardboards inside albums (not sure if theirs is PVC free).

actually, i have a couple of coins enclosed in mylar holders on a pvc album. so far, wala namang problema. BUT one expert explicitly insisted on the usage of pvc-free album even if the coins are in a mylar holders, especially if these are copper and bronze. I will ask someone further about this scenario - mylar on a pvc album..



Quote :
) What do you advise? Cotton gloves or latex (the ones they use at the hospital?) - for handling coins

i prefer cotton gloves because it doesn't leave fingerprints. but then again with or without gloves, always handle the coins at their edges... btw, i would like to share to you the experience of this collector in using both the cotton and latex gloves:

" I tested both out going through alot of new coins and in the end you sweat in either glove if you wear them for long periods of time.
I found it's best to use both at the same time especially if you are looking at alot of coins or will be wearing them for 15 minutes or more at a time.
Wear the latex glove under the cotton glove. The latex one stops sweat getting through to the coins and the cotton glove stops the latex gloves from making contact with the coins if you are worried about that.
I've never had a problem using this method."




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PostSubject: To clean, or not to clean   Tue Aug 02, 2011 7:46 am

First, a couple comments. Earlier in this thread someone referred to "recognized numismatist groups offering services in cleaning coins." I know of not a single, reputable numismatic organization that sanctions or encourages cleaning of coins.

In addition, experience suggests that all approaches to cleaning carry at least a risk of unintentional damage to coins. Even cleaning with soap or acetone can cause damage, especially if the cleaning agent is left in contact with the coin surfaces for too long.

The references to acetone are the main reason I wanted to reply. If you insist on using acetone to clean your coins, I recommend purchasing it from a hardware or drug store, but avoid using "nail polish remover." Nail polish remover contains a relatively small amount of acetone, combined with other ingrediaents to make it less flammable and less harmful to nails and skin. I would avoid using anything other than pure acetone for coins.

Kalookan
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PostSubject: Re: Cleaning coins / bank notes   Tue Aug 02, 2011 9:03 am

Oh no! Shocked

I just bought 3pcs "Young's Nail Polish Remover" at 7php each last night.

I did not know that there's a difference.


Whew! Thanks for the information by the way.
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PostSubject: Re: Cleaning coins / bank notes   Tue Aug 02, 2011 9:09 am

denrico wrote:


yes that's the one.. well, if you will visit the World Treasures maybe you could share to us( specially to me Very Happy ) how much is the 2x2 mylar coin holder now and whether they have a website.. I'm from Mindanao and it's really hard buying these mylar holders here.


Will do, will let you know in a week.
Thanks!
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PostSubject: Re: Cleaning coins / bank notes   Tue Aug 02, 2011 9:14 am

For the record, I'm not a chemist, but the problem with nail polish remover instead of pure acetone is simple: If it contains ANY acetone, that ingredient is diluted with oils. Many nail polish removers contain very little if any acetone. These have a substitute compound known as ethyl acetate.

As I said originally, I'd be very careful, and make sure you buy only pure acetone. Substitutes for acetone have been introduced to avoid intentional acetone inhalation, and I will leave it at that.

Kalookan
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PostSubject: Re: Cleaning coins / bank notes   Tue Aug 02, 2011 4:51 pm

i agree that any sort of cleaning risks exposing your coins to possible damage.

i use acetone to clean coins with signs of pvc contamination because i personally believe that i am better off with a coin that has taken an acetone bath as compared to a coin with long term pvc contamination.
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PostSubject: Re: Cleaning coins / bank notes   Tue Aug 02, 2011 6:20 pm

@ Market! Market!

This is the acetone that I have been using of..


I don't know if you could buy a pure acetone there in Metro Manila because EricGo had a hard time looking for it.

I would also like to warn you to be very careful when using this product. Always have a good ventilation. The liquid is so volatile and very flammable.

And even if the bottle say "pure Acetone", always test it. I always test my acetone to be sure. I pour some acetone on a ceramic bowl, and let it evaporate. If there's some residue that are left over, then this is not a pure one.. Don't use this. A good one will leave no residue on the bowl.
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PostSubject: Re: Cleaning coins / bank notes   Wed Aug 03, 2011 4:23 am

I just used the ones I bought.
No residue, so is it pure?
I will buy those, will look for them at hardware stores.


Just sharing my experience:
> Acetone bath did not make my coins shiny (normal coins - not gold/silver).
> Acetone bath did not "clean" my coins. (Hard dirt, melted rubber, moss/fungus? LOL)
> Acetone bath immediately cleaned my coins with "pentel pen" damage. (As soon as I drop the coin it removed the pentel pen stains hahaha LOL, I was really amazed).
> Acetone is really cold (I accidentally spilled some on my hands).
> They also smell really strong.
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PostSubject: Re: Cleaning coins / bank notes   Wed Aug 03, 2011 6:55 am

Quote :
> Acetone bath did not "clean" my coins. (Hard dirt, melted rubber, moss/fungus? LOL)

why don't you post some pics for all of us to see?
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