can this be saved (PVC)?... update

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DHalladay
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can this be saved (PVC)?... update

Post by DHalladay » Sat Feb 06, 2021 1:40 am

I have no knowledge beyond "put it in a jar overnight". Can someone with skills give me a diagnosis and/or basic instructions?
DSC_9029 PVC.jpg
DSC_9029 PVC.jpg (255.11 KiB) Viewed 1020 times
Last edited by DHalladay on Thu Feb 11, 2021 7:55 pm, edited 1 time in total.
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messydesk
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Re: can this be saved (PVC)?

Post by messydesk » Sat Feb 06, 2021 1:46 am

It's a little yellowish for PVC. I'd want to look at it up close. An acetone soak overnight, followed by a clean acetone rinse, might take care of it, but poking with a stick might be needed, too.
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DHalladay
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Re: can this be saved (PVC)?

Post by DHalladay » Sat Feb 06, 2021 3:02 am

Yellowish?
It's emerald green to my eyes.
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messydesk
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Re: can this be saved (PVC)?

Post by messydesk » Sat Feb 06, 2021 3:23 am

DHalladay wrote:
Sat Feb 06, 2021 3:02 am
Yellowish?
It's emerald green to my eyes.
Yellowish as compared to the usual bluish green of PVC goo.
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Kurt28
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Re: can this be saved (PVC)?

Post by Kurt28 » Sat Feb 06, 2021 3:38 am

If the acetone treatments don't remove all of the green, I would consider Verdi-Care from Wizard.
I bought a trial size 6 years ago, and still half of it. A little goes a long way.
As always, test first on coins of low value.

I have tried my hand a coin conservation, but only on junk coins.
This Swedish 10 Ore is .400 silver, and as you might expect, the area under the contamination has not oxidized as the rest of the coin.
Sweden.jpg
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The most dramatic conservation was to a North Song Dynasty Cash Coin.
Unfortunately I didn't bother to make a before and after set of photos.

But I can offer you a few pics just for entertainment...
Syria1K.jpg
Syria1K.jpg (211.85 KiB) Viewed 990 times
Maurit1K.jpg
Maurit1K.jpg (174.58 KiB) Viewed 990 times
Portugal1K.jpg
Portugal1K.jpg (190.26 KiB) Viewed 990 times
Quad800b.jpg
Quad800b.jpg (116.28 KiB) Viewed 990 times

blh74
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Re: can this be saved (PVC)?

Post by blh74 » Sat Feb 06, 2021 6:24 am

Those look a lot better. Good job.

Geseas
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Re: can this be saved (PVC)?

Post by Geseas » Sat Feb 06, 2021 4:14 pm

I found this thread very useful when dealing with acetone. viewtopic.php?f=4&t=3783&p=33056&hilit= ... ass#p33056 You may have already seen it.
The way @Kurt28 uses the shot glass so only the very tips of the coins reeds touch the glass surface works great. No finger prints because no real handling, only pure acetone and air exposure, that's all. I used two roly poly cordial glasses on my first adventure. They seem made for this job. The two cordial glasses 'nest', one on top of the other. This is very convenient. Its a little tippy but a good seal. A testament to glass maker.
GCS3813.JPG
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gcs_ drying mode.JPG
gcs_ drying mode.JPG (88.45 KiB) Viewed 941 times
The chemists on this site
(distilled spirit connoisseurs are chemists, IMO.) will notice in that second roly poly is not the used dirty acetone, just water.
Water is not used here.
With a little practice, I was able to change which side of coin was facing up while in the acetone bath. A toothpick assisted with this. I feel a little agitation and frequent clean acetone change was important. I did not reuse that acetone. It quickly dissipated, leaving behind a greasy residue. This residue may be a testament to the quality of acetone being used? It also could be left-overs from a reaction between acetone and the gunk. There are a lot of different purities of something called 'pure'.

Cotton is good with acetone; no reaction; but that stick on some swabs is a completely different matter. I have heard their are cotton swabs with sticks that do not react with acetone; maybe available at electronics supply?

Here are some photos of my first coin using the acetone process as an experiment. I do not know the composition of the goop. I do know pure acetone will not react with silver. The periodic acetone baths, inspection, air drying are roughly documented this photographs and uploaded using A Google Sharing thing; which is an experiment for me also. :D Hope it works: https://drive.google.com/drive/folders/ ... sp=sharing

@messydesk has taken time to 'look at' this type of sharing. My take on it is; sharing like this maybe Ok, but still wear that mask! :D

Note: JB's comment 'on another thread' regarding the use of a clean acetone rinse just before that final 'drying' of coin, makes a lot of sense. Any residue left on coin after final bath gets that last chance to leave.
Last edited by Geseas on Sun Feb 14, 2021 4:14 pm, edited 15 times in total.

JohnGoldsmith
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Re: can this be saved (PVC)?

Post by JohnGoldsmith » Sat Feb 06, 2021 8:06 pm

Always remember plan B, it can be a Bunny coin grade.

Geseas
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Re: can this be saved (PVC)?

Post by Geseas » Sat Feb 06, 2021 8:34 pm

JohnGoldsmith wrote:
Sat Feb 06, 2021 8:06 pm
Always remember plan B, it can be a Bunny coin grade.
Thank you for reminder. DHalladay's coins are arguably one of thee finest grades; or, maybe it's just the way he can photograph his Bunnies? :D

OT note:
I have been photographing these cordial glasses and just found this on the bottoms. Studying coin sharpens your detail view.
GCS3819.JPG
GCS3819.JPG (52.46 KiB) Viewed 922 times
The other has a different message/signature? Weird...Maybe I shouldn't be messing with my wifes stuff.
GCS3820.JPG
GCS3820.JPG (100.51 KiB) Viewed 913 times
I am very easily distracted these days.
Last edited by Geseas on Sun Feb 07, 2021 12:17 am, edited 2 times in total.

JohnGoldsmith
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Re: can this be saved (PVC)?

Post by JohnGoldsmith » Sat Feb 06, 2021 10:01 pm

Geseas wrote:
Sat Feb 06, 2021 8:34 pm
JohnGoldsmith wrote:
Sat Feb 06, 2021 8:06 pm
Always remember plan B, it can be a Bunny coin grade.
Thank you for reminder. DHalladay's coins are only of thee finest grade; or, maybe it just the way he photographs his Bunnies? :D

OT note:
I have been photographing these cordial glasses and just found this on the bottoms:GCS3819.JPG The other has a different message/signature? Weird...Maybe I shouldn't be messing with my wifes stuff.GCS3820.JPG

I am very easily distracted these days.
So your saying my coins are junk, removed from my will.

Geseas
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Re: can this be saved (PVC)?

Post by Geseas » Sat Feb 06, 2021 10:24 pm

Thanks again JohnGoldsmith. I am going to add the word 'arguably' and the letter 's'. to my above statement. I sure wish I could do that in real life; back up and edit.
Back in the Will? :D
I want to be nice to Dennis in an effort to learn scribbles. Not that he is the only one that knows them...
Last edited by Geseas on Sun Feb 07, 2021 12:23 am, edited 4 times in total.

keydates
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Re: can this be saved (PVC)?

Post by keydates » Sat Feb 06, 2021 10:33 pm

Since I work on cars etc I buy O Reilly auto parts.
They have cans of break clean in spray can.
I have sprayed coins with it.
Have done high grade coins and what ever I want to and have run them through pcgs without any problems.
To me the force of spray might cut crud better than soaking.
Can always dip in acetone after if you wish.

Larry

keydates
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Re: can this be saved (PVC)?

Post by keydates » Sat Feb 06, 2021 10:34 pm

I use the small red pipe on can to get more pressure
Larry

blh74
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Re: can this be saved (PVC)?

Post by blh74 » Sun Feb 07, 2021 6:02 am

I will try your suggestion, thanks

DHalladay
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Re: can this be saved (PVC)?... update

Post by DHalladay » Thu Feb 11, 2021 7:57 pm

The answer is a resounding yes!

It turns out that one of my local coin dealer buddies has skills and experience that are off the chart. :D I need to call him "Doctor" from now on.

after rev small.jpg
after rev small.jpg (235.91 KiB) Viewed 777 times
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messydesk
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Re: can this be saved (PVC)?... update

Post by messydesk » Thu Feb 11, 2021 9:22 pm

Looks nice. Was it PVC goo, something else, or a secret?
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DHalladay
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Re: can this be saved (PVC)?... update

Post by DHalladay » Thu Feb 11, 2021 9:47 pm

messydesk wrote:
Thu Feb 11, 2021 9:22 pm
Looks nice. Was it PVC goo, something else, or a secret?
Unknown. All I knew was "green".
I sent him the photo at the top of this thread; he said, "I'm pretty sure I can remove that."
I showed him the coin in person and he said, "Yep, I can fix that."
He didn't go into detail about what it was, but for this particular coin (he made a note of pointing that out) he went straight to a q-tip and this product:

IMG_20210211_105535143.jpg
IMG_20210211_105535143.jpg (102.12 KiB) Viewed 757 times
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Kurt28
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Re: can this be saved (PVC)?... update

Post by Kurt28 » Thu Feb 11, 2021 10:49 pm

Glad the coin was saved.
And now I have another process to investigate and with to experiment.

iwillbenice
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Re: can this be saved (PVC)?... update

Post by iwillbenice » Thu Feb 11, 2021 11:52 pm

I still see it. :lol:

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messydesk
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Re: can this be saved (PVC)?... update

Post by messydesk » Fri Feb 12, 2021 5:40 am

Hydrofluoric acid. Nasty stuff.
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