| Author |
 Replies: 18 / Views: 2,140 |
Page 2 of 2
|
|
|
|
Bedrock of the Community
United States
94367 Posts |
Looks the craquelure on an old painting.
|
|
Valued Member
 United States
101 Posts |
the part that throws me off is the close up of nose area, seeing the lines 'into' the metal . rather than on the surface of the metal?
|
|
Pillar of the Community
United States
3472 Posts |
Looks like it may have been dipped in something that shrunk and cracked after it dried...
|
|
Bedrock of the Community
United States
62064 Posts |
I've seen this before. Almost looks like it was frozen for a time in a freezer? But not a keeper as the surface is not normal. Spender. (if you can find a cashier who knows what it is?)
|
|
Pillar of the Community
United States
1566 Posts |
Looks like someone painted it with Silver crackle paint. I have used this paint to apply to some lamps I refinished.
|
|
Valued Member
United States
101 Posts |
thanks coop, cold to hot with expanding metal created effect. sounds about right. still might keep it anyways, its a cool looking coin.
take care,
|
|
Bedrock of the Community
United States
10038 Posts |
Quote:
...cold to hot with expanding metal created effect... I admit I am skeptical about this from the metals being used, but I am not positive. It would be interesting to get some liquid nitrogen to try to reproduce this affect. Personally I think its a keeper just for being unique  |
|
Valued Member
United States
101 Posts |
liquid nitrogen... mad scientist mixes with coin collector.... sounds interesting
thanks for the reply.
take care,
|
|
Bedrock of the Community
United States
10038 Posts |
I used to be a chemistry teacher. Liquid nitrogen is not hard to obtain and is not expensive. Look into a company that sells ice and/or CO2. Transporting is not under any special laws as you only need a styrofoam container or even a just an insulator drink holder (thermos). Do a little homework, wear some good leather gloves, respect it and there will be no problems.
But I would think if this would have a chance at working you would need maybe a kiln to put it into immediately after you let it stay in the Nitrogen (I would go with overkill and let it sit at least 10 minutes - I think that is how long it took to solidify an egg when I used to do it). Again, I am skeptical, but would love to be wrong! In fact if I were not in the process of moving, you have me interested enough that I might have tries it. I can get the Nitrogen literally 2 blocks away from where I live right now!
|
|
Bedrock of the Community
United States
17884 Posts |
I've seen it before. Usually on the surfaces of coins that have been recovered from sewers. Apparently silt on the surfaces dries and cracks exposing the coin surfaces in the cracks to the acidic sewer water which eats away at the surface in the shape of the cracks.
|
|
Valued Member
United States
101 Posts |
Frozen science project coin? Sewer Coin? I am shooting for a " Bored Laser Technican Coin " It is a fun hobby.
|
|
Pillar of the Community
United States
7512 Posts |
I am with Conder101 on this, only a corrosive substance would cause this type damage!
|
|
Moderator
 United States
188952 Posts |
Quote:
I've seen it before. Usually on the surfaces of coins that have been recovered from sewers.  |
|
Pillar of the Community
United States
3658 Posts |
Quote:
I've seen it before. Usually on the surfaces of coins that have been recovered from sewers. Apparently silt on the surfaces dries and cracks exposing the coin surfaces in the cracks to the acidic sewer water which eats away at the surface in the shape of the cracks.  Spot on. Cupronickel alloys are susceptible to erosion corrosion. A caustic environment with heavy liquid flow - like a sewer - can corrode common 70-30 cupronickel. The outer clad layer here is 75-25, which has similar enough properties. I'll bet the copper clad layer is discolored, but largely unaffected. |
|
Bedrock of the Community
United States
10038 Posts |
Very educational! I am glad someone knew what this was.
So we can flush the idea of the freeze and heat method down the drain.
...that was a pun gents.
I know, the puns stink.
Two thirds of a pun: P U
Edited by Earle42
06/04/2019 11:46 pm
|
|
Page 2 of 2
|
Replies: 18 / Views: 2,140 |
Page 2 of 2
|
First Page
Posted 06/03/2019 1:21 pm
