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Collectibles版 - How To Remove PVC Residue From Coins (ZT)
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相关话题的讨论汇总
话题: pvc话题: coin话题: acetone话题: residue话题: plastic
进入Collectibles版参与讨论
1 (共1页)
m*****u
发帖数: 19562
1
PVC damage is caused by storing coins in soft plastic flips that contain polyvinyl chloride (PVC.) PVC most commonly manifests as a light-to-dark greenish residue, although it can appear as milky or light grey in color. It has a distinctive "plastic" odor which can range from subtle to strong. I recommend treating coins for PVC residue whenever you can smell PVC on them, even if you don't see the greenish residue yet, because if the coin has a plastic stink, the PVC breakdown process has begun. For more information about PVC and what causes it, see What is PVC Damage?
Difficulty: Easy
Time Required: About 10 minutes, including prep and clean-up time.
Here's How:
1. Put on latex gloves and eye protection. Make sure you have good ventilation, and avoid using the kitchen or any area where an open flame is present. Acetone is a powerful chemical that is extremely flammable. Although acetone doesn't burn the skin (it is a key ingredient in some nail polish removers,) you should avoid unnecessary contact.
2. Pour a very small amount of acetone into the container. (Don't use plastic because acetone will melt it.) You only need about 1/4 to 1/2 ounce if you use a small drinking glass, or tiny jar. You need only enough to cover the coin by about 1/4 inch.
3. Gently place the coin with PVC residue into the dish, and swirl the acetone around for about 30 seconds. If both sides of the coin are affected, turn it over and swirl the other side.
4. Remove the coin and let it air dry. If the PVC residue is still present, continue with Step 5. If the coin is clean, proceed to your next coin, and when finished dispose of the acetone by pouring it into a resealable jar. Never pour acetone down a drain, or let more than a very small amount evaporate. Acetone is considered hazardous and must be handled appropriately.
5. If the coin still needs further cleaning after swirling (and in my experience, most do), take a cotton swab (such as a Q-Tip) and dip it into the acetone. (Don't use cotton swabs with plastic sticks!) Then, using a firm and steady hand, roll the swab across the coin's surface on the PVC-infected areas, taking care not to use any sort of rubbing or abrasive maneuver. If the coin has a lot of PVC residue, you should replace the swab every few "rolls." Keep rolling, using new swabs as needed, until the coin appears clean, and then swirl it again to finish.
Tips:
1. Never rub the coin with the cotton swab. Use only rolling motions. The slightest abrasion might cause hairlines to the coin's surface.
2. Sometimes PVC residue can be stubborn and will not respond to rolling. Try soaking the coin in a sealed jar of acetone for 24 hours before attempting the rolling maneuver again. If rolling still fails, try more intensive, higher-pressure "dabbing" (but don't "scrub!") If the PVC residue still doesn't respond (in other words, if the swab isn't picking up anything at all,) your coin may not be cleanable (or maybe it's not PVC residue that you see on the coin.) You could try sending it to NCS for expert conservation.
3. To prevent future PVC damage, do not store your coins in soft or pliable plastic flips. Use the more inflexible Mylar flips instead. Never store your coins in any kind of plastic containers that have a smell.
What You Need:
* Full-strength acetone (sold where paint supplies are found)
* Small glass or metal dish (PVC melts plastic!)
* Coin with PVC damage
* Latex or rubber gloves
* Protective eye-wear
* Cotton swabs (such as Q-Tips)
m*****u
发帖数: 19562
2
有人知道哪里可以买到丙酮吗?
打算清一下我那几个99分的大头, 船洋

polyvinyl chloride (PVC.) PVC most commonly manifests as a light-to-dark
greenish residue, although it can appear as milky or light grey in color. It
has a distinctive "plastic"
ventilation, and avoid using the kitchen or any area where an open flame is
present. Acetone is a powerful chemical that is extremely flammable.
Although acetone doesn't burn the s
plastic because acetone will melt it.) You only need about 1/4 to 1/2 ounce
if you use a small drinking glass, or tiny jar. You need only enough to
cover the coin by about 1/4 i
acetone around for about 30 seconds. If both sides of the coin are affected,
turn it over and swirl the other side.
present, continue with Step 5. If the coin is clean, proceed to your next
coin, and when finished dispose of the acetone by pouring it into a
resealable jar. Never pour acetone dow
experience, most do), take a cotton swab (such as a Q-Tip) and dip it into
the acetone. (Don't use cotton swabs with plastic sticks!) Then, using a
firm and steady hand, roll th

【在 m*****u 的大作中提到】
: PVC damage is caused by storing coins in soft plastic flips that contain polyvinyl chloride (PVC.) PVC most commonly manifests as a light-to-dark greenish residue, although it can appear as milky or light grey in color. It has a distinctive "plastic" odor which can range from subtle to strong. I recommend treating coins for PVC residue whenever you can smell PVC on them, even if you don't see the greenish residue yet, because if the coin has a plastic stink, the PVC breakdown process has begun. For more information about PVC and what causes it, see What is PVC Damage?
: Difficulty: Easy
: Time Required: About 10 minutes, including prep and clean-up time.
: Here's How:
: 1. Put on latex gloves and eye protection. Make sure you have good ventilation, and avoid using the kitchen or any area where an open flame is present. Acetone is a powerful chemical that is extremely flammable. Although acetone doesn't burn the skin (it is a key ingredient in some nail polish removers,) you should avoid unnecessary contact.
: 2. Pour a very small amount of acetone into the container. (Don't use plastic because acetone will melt it.) You only need about 1/4 to 1/2 ounce if you use a small drinking glass, or tiny jar. You need only enough to cover the coin by about 1/4 inch.
: 3. Gently place the coin with PVC residue into the dish, and swirl the acetone around for about 30 seconds. If both sides of the coin are affected, turn it over and swirl the other side.
: 4. Remove the coin and let it air dry. If the PVC residue is still present, continue with Step 5. If the coin is clean, proceed to your next coin, and when finished dispose of the acetone by pouring it into a resealable jar. Never pour acetone down a drain, or let more than a very small amount evaporate. Acetone is considered hazardous and must be handled appropriately.
: 5. If the coin still needs further cleaning after swirling (and in my experience, most do), take a cotton swab (such as a Q-Tip) and dip it into the acetone. (Don't use cotton swabs with plastic sticks!) Then, using a firm and steady hand, roll the swab across the coin's surface on the PVC-infected areas, taking care not to use any sort of rubbing or abrasive maneuver. If the coin has a lot of PVC residue, you should replace the swab every few "rolls." Keep rolling, using new swabs as needed, until the coin appears clean, and then swirl it again to finish.
: Tips:

h***e
发帖数: 20195
3
你随便找个做化学或者做生物的博士后

It
is
ounce

【在 m*****u 的大作中提到】
: 有人知道哪里可以买到丙酮吗?
: 打算清一下我那几个99分的大头, 船洋
:
: polyvinyl chloride (PVC.) PVC most commonly manifests as a light-to-dark
: greenish residue, although it can appear as milky or light grey in color. It
: has a distinctive "plastic"
: ventilation, and avoid using the kitchen or any area where an open flame is
: present. Acetone is a powerful chemical that is extremely flammable.
: Although acetone doesn't burn the s
: plastic because acetone will melt it.) You only need about 1/4 to 1/2 ounce

h***e
发帖数: 20195
4
或者你直接去ALDRICH上面买,很便宜的

It
is
ounce

【在 m*****u 的大作中提到】
: 有人知道哪里可以买到丙酮吗?
: 打算清一下我那几个99分的大头, 船洋
:
: polyvinyl chloride (PVC.) PVC most commonly manifests as a light-to-dark
: greenish residue, although it can appear as milky or light grey in color. It
: has a distinctive "plastic"
: ventilation, and avoid using the kitchen or any area where an open flame is
: present. Acetone is a powerful chemical that is extremely flammable.
: Although acetone doesn't burn the s
: plastic because acetone will melt it.) You only need about 1/4 to 1/2 ounce

m*****u
发帖数: 19562
5
不就是身边不认识嘛。。。
当年我做科研工作者的时候,用丙酮颇干过一些有趣的事情。。。

【在 h***e 的大作中提到】
: 你随便找个做化学或者做生物的博士后
:
: It
: is
: ounce

h***e
发帖数: 20195
6
那你就从VWR或者ALDRICH上买吧

【在 m*****u 的大作中提到】
: 不就是身边不认识嘛。。。
: 当年我做科研工作者的时候,用丙酮颇干过一些有趣的事情。。。

m*****u
发帖数: 19562
7
恩, 好的, 多谢了,这些东西以后估计也用的到。 就是味道冲了点.:P

【在 h***e 的大作中提到】
: 那你就从VWR或者ALDRICH上买吧
h***e
发帖数: 20195
8
没事,这玩意毒性几乎没有,我手直接接触过很多次,没有关系,不习惯的话在院子弄
或者厨房弄就好了

【在 m*****u 的大作中提到】
: 恩, 好的, 多谢了,这些东西以后估计也用的到。 就是味道冲了点.:P
z***x
发帖数: 851
9
给你个link,这个很专业, capsule 什么的都卖。
http://www.air-tites.com/coin_cleaners.htm
你先拿几个流通quarter啥的试手,有点感觉了再上真金白银。
将来成高手了帮我清个金币上的指印。

It
is
ounce

【在 m*****u 的大作中提到】
: 有人知道哪里可以买到丙酮吗?
: 打算清一下我那几个99分的大头, 船洋
:
: polyvinyl chloride (PVC.) PVC most commonly manifests as a light-to-dark
: greenish residue, although it can appear as milky or light grey in color. It
: has a distinctive "plastic"
: ventilation, and avoid using the kitchen or any area where an open flame is
: present. Acetone is a powerful chemical that is extremely flammable.
: Although acetone doesn't burn the s
: plastic because acetone will melt it.) You only need about 1/4 to 1/2 ounce

m*****u
发帖数: 19562
10
这是个手艺活, 学会了有好处。。。

【在 z***x 的大作中提到】
: 给你个link,这个很专业, capsule 什么的都卖。
: http://www.air-tites.com/coin_cleaners.htm
: 你先拿几个流通quarter啥的试手,有点感觉了再上真金白银。
: 将来成高手了帮我清个金币上的指印。
:
: It
: is
: ounce

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ebay 在ebates.com的CB率好像变了。BSO coin
有何感想?材料价转让金银币 附图
問:gold MLF 和 Philharmic gold coin , buffalo bullion有收藏意義麼?新手请教 - 有没有值得买的coin?该offer多少?
进入Collectibles版参与讨论
h***e
发帖数: 20195
11
这个事情就是选合适的有机溶剂,有机溶剂一般不会对金属起任何不良影响
但是有的复杂配方里面会有各种适量的添加剂或者酸碱,螯合剂
遇到酸碱,螯合剂等就得小心了

【在 z***x 的大作中提到】
: 给你个link,这个很专业, capsule 什么的都卖。
: http://www.air-tites.com/coin_cleaners.htm
: 你先拿几个流通quarter啥的试手,有点感觉了再上真金白银。
: 将来成高手了帮我清个金币上的指印。
:
: It
: is
: ounce

m*****u
发帖数: 19562
12
我用coin dip的, 但是洗过的银币
过了一段时间以后发红。

【在 h***e 的大作中提到】
: 这个事情就是选合适的有机溶剂,有机溶剂一般不会对金属起任何不良影响
: 但是有的复杂配方里面会有各种适量的添加剂或者酸碱,螯合剂
: 遇到酸碱,螯合剂等就得小心了

h***e
发帖数: 20195
13
那应该是酸或者螯合剂,你有可能浸泡时间长了
建议洗完后要清水洗2-3次除去残存的药剂,然后棉花蘸酒精搽干
过两天我来拿些铜币试试丙酮,麻痹的我手头的铜币也不便宜
丙酮这些有机溶剂只能除高分子或者胶黏附,而且丙酮不是最好的,要除锈还是得靠稀
酸/螯合剂慢慢弄,我觉得谨慎点基本不会弄坏的

【在 m*****u 的大作中提到】
: 我用coin dip的, 但是洗过的银币
: 过了一段时间以后发红。

m*****u
发帖数: 19562
14
dip了3次,呵呵
不过来的便宜, 再怎么dip都能赚, 还翻倍。

【在 h***e 的大作中提到】
: 那应该是酸或者螯合剂,你有可能浸泡时间长了
: 建议洗完后要清水洗2-3次除去残存的药剂,然后棉花蘸酒精搽干
: 过两天我来拿些铜币试试丙酮,麻痹的我手头的铜币也不便宜
: 丙酮这些有机溶剂只能除高分子或者胶黏附,而且丙酮不是最好的,要除锈还是得靠稀
: 酸/螯合剂慢慢弄,我觉得谨慎点基本不会弄坏的

h***e
发帖数: 20195
15
别DIP,拿个棉花棒蘸着仔细搽需要处理的部位

【在 m*****u 的大作中提到】
: dip了3次,呵呵
: 不过来的便宜, 再怎么dip都能赚, 还翻倍。

m*****u
发帖数: 19562
16
proof的上棉花会不会留下hairline?

【在 h***e 的大作中提到】
: 别DIP,拿个棉花棒蘸着仔细搽需要处理的部位
h***e
发帖数: 20195
17
刚开始没搽干净的时候有可能,擦到后面不会的,你最后收工的时候用丝绸蘸酒精搽一
下就好,眼睛布也可以,这些都不会影响表面的

【在 m*****u 的大作中提到】
: proof的上棉花会不会留下hairline?
m*****u
发帖数: 19562
18
好的, 受教了!!

【在 h***e 的大作中提到】
: 刚开始没搽干净的时候有可能,擦到后面不会的,你最后收工的时候用丝绸蘸酒精搽一
: 下就好,眼睛布也可以,这些都不会影响表面的

a*****4
发帖数: 3081
19
买丙酮不用那么麻烦,ace五金店就有卖的。丙酮能搞定手指印吗?
h***e
发帖数: 20195
20
能,我看医用酒精就应该可以

【在 a*****4 的大作中提到】
: 买丙酮不用那么麻烦,ace五金店就有卖的。丙酮能搞定手指印吗?
1 (共1页)
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话题: pvc话题: coin话题: acetone话题: residue话题: plastic